Obsidian's Scott Everts attributes some of the performance issues and simplifcation present in the game to the fact it wasn't a PC exclusive.

The Feral Ghoul Roamer has an error when loaded into editing software. While this doesn't cause conflicts in the game itself, the model attempts to draw from a model labeled "mmm_ghoulvariant_v1.nif". This is one of the feral ghoul variants that appeared in the Fallout 3 mod Mart's Mutant Mod, suggesting that Obsidian Entertainment had experimented with it while developing new features for the game.

There was originally an NCR super mutant ranger named Chauncey stationed at Station Foxtrot. he was included in early builds of the game, but ultimately cut prior to release.

By using console commands during the ending slideshow it's possible to find a character called "Ron the Narrator", who is used to narrate the slides and other sections of the game.

He can be seen wearing Legion armour, and is based off the actual narrator, Ron Perlman.

As a unique pre-order bonus at K-Mart, buyers received four coasters representing the four major casino found in the game, The Ultra-Luxe, Vault 21, The Tops, and the Lucky 38.

The Mr. New Vegas radio show has unused news reports detailing the outcomes of each game ending, which cannot be witnessed as the game doesn't allow you to play past the ending due to the drastic differences the game world would experience based on the outcome.

Dennis Crocker was originally planned to be Caucasian, but his lines were voiced by a non-Caucasian voice actor so the developers changed the character's appearance accordingly.
His original design can still be seen on the collectors edition playing cards.

A Vault Boy image named "perk_survivalist" appears in the game files. It differs in appearance from the original survivalist perk (found in Fallout, Fallout 2, and Fallout Tactics), and its unclear what it would do as it was never implemented into the game though it seems to imply that the perk was originally planned to appear in New Vegas.

Despite a higher resolution texture being available in the game's resources, the Spiked Knuckles used by the player do not use the high resolution texture.

When playing as a character with low intelligence and speaking to the vagrant in Freeside while doing the quest "I Can Make You Care", using intelligence to inquire about weapons and other precious loot will cause him to speak clearly and intelligently, and to caution the player to avoid his current predicament.

This seems to be a reference to Torr from Fallout 2 who has a similar string of interactions with low intelligence players.

Matthew Perry was cast in Fallout: New Vegas due to being a fan of the previous game; Fallout 3. He also gave away a signed copy of Fallout 3, not because he was in it, but rather just because he claimed it was his favorite game.

A Wrecked Highwayman can be found half-submerged in mud and, upon finding it, one of two background songs from Fallout 2 ("My Chrysalis Highwayman" or "Gold Slouch") will play. The trunk is filled with Energy ammunition, making it a nod towards the Highwayman in Fallout 2, which used Energy ammo as a fuel source. The original idea for this encounter came from J.E. Sawyer, who originally planned it for the cancelled Van Buren game, which would have included the Tanker FOB in the trunk from Fallout 2.

If the player has the Wild Wasteland trait, and nukes both the NCR and Caesar's Legion at the end of the Lonesome Road DLC, the ending slide will Spoiler:quote Charlton Heston and show a picture representing the ending scene from the original Planet of the Apes.

In the "Dead Money" DLC, when entering the wine cellar near the bell tower from which the player triggers the Gala Event, the phrase "I AM NOT YOUR MUMMY" is scrawled on the central pillar. This is in reference to the Ghosts' gas masks and the two-part episode of Doctor Who, "The Empty Child and The Doctor Dances".

If the player chooses to arm Archimedes I and leave Fantastic alive, in the quest "That Lucky Old Sun", upon returning the player will find Fantastic wearing Legion armor and having just killed his co-worker, Ignacio Rivas, stating "Hey man, when in Rome."

A portrait of the mother and father of Fallout 3's protagonist, The Lone Wanderer, can be found in Vault 21, next to Sarah's bed.

The Child at Heart perk from Fallout 3 was set to return to New Vegas, but was ultimately cut, most likely because there are very few children in the game. Unused dialogue can still be found within the game's audio files, however.

The challenge "A Slave Obeys" requires the player to Spoiler:kill Mr. House with the 9 Iron or Nephi's Golf Driver. This is a reference to the original Bioshock, in which the player Spoiler:beats the game's main antagonist, Andrew Ryan, to death with a 9 iron while he repeats the words "A man chooses, a slave obeys."

The perk "In Shining Armor" doesn't actually do anything. The perk was supposed to give the player an additional +5 Damage Threshold against energy weapons while wearing any metal armor, and +2 while wearing reflective eyewear.

The perk doesn't provide any Damage Threshold boost due to the fact that the parameter that is referenced when checking the skill type of enemy weapons is "Energy" instead of "EnergyWeapons". This means that the function "IsWeaponSkillType" will never return a value that can activate the perk effect, because there is no weapon skill called "Energy".

With the Wild Wasteland perk activated, players can find the words "Romanes eunt domus" written on the side of a building in Cottonwood Cove. This is a reference to the Monty Python movie, "Life of Brian", in which Brian attempts to graffiti "Romans go home" on a building in Latin. However, the statement has several translation errors (much to the chagrin of a passing centurion) and literally translates to "People called Romanes they go the house."

Most of the Honest Hearts Tribals speak a creole language.

The Dead Horses' language is based on German, English, and Navajo, although the morphology of the Navajo is unrecognizable.

The White Legs speak a combination of languages from tourists and locals in a place called Res.

The Sorrows language seems to be a combination of broken English, German, Spanish, and hints of Japanese.

It is said by Joshua Graham in the Honest Hearts DLC that the .45 Auto pistol is based on a nearly 400-year-old design from one of his Mormon ancestors and is the trademark weapon of the New Canaanite tribe. This alludes to the creator of the real-life pistol this gun is based on, the M1911, created by John Moses Browning. Like the New Canaanites, Browning was a member of the Mormon church from Utah.

Though not an exact replica, the .45 auto submachine gun in the Honest Hearts DLC is based off of the Thompson submachine gun.

New Canann, the town where Joshua Graham and Daniel hail from, was named after the land promised to Abraham and his followers in the Bible. This is likely due to the people of New Canann being Mormon.

The text on Joshua Graham's pistol, A Light Shining in Darkness, is Greek. It reads "καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει (kaì tò phõs én tẽ skotía phaínei)" on the right side and "καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν (kaì é skotía aútò oú katélaben)" on the left side, which translates as "And the light shineth in darkness and the darkness comprehended it not".

Zion Canyon, from the Honest Hearts DLC, is based on Zion National Park, a favorite holiday destination of New Vegas lead designer Joshua Sawyer.

There were originally plans for romance speech options and game endings for companions, but the idea was ultimately cancelled before any work was done on it. According to Jason Bergman (the Senior Producer for New Vegas), "Tt was clear that it wasn't going to be fun or interesting in any way. Also Avellone really hates romance in games."

One of the romance ideas that was talked about was if you romanced Cass, you were both going to get drunk and wake up married. And there was another idea where if your rep was high enough, the player would get married to their companion by the King, with him singing "Love Me Tender" a la Nicholas Cage in Wild at Heart.

Ulysses was originally going to be a companion, but was cut from the final version of the game and then put back in for the Lonesome Road DLC as the main antagonist.

This would have made him a Legion-sympathetic companion and would help explain Legion backstory elements, as there wasn't much Legion support from any of the other companions. He would have also reacted strongly to NCR/Legion conflict and the player's role in it, acting as a sounding board when possible.

Benny is based off of Benjamin "Bugsy" Siegel, who was an American mobster and one of the main driving forces in the development of the Las Vegas strip. There is also a striking resemblance between the two men's signature checkerboard suits.

Mr. New Vegas is voiced by Wayne Newton, who is known as Mr. Las Vegas in real life. The designers created the role for Newton "because he is Las Vegas," and that "he really brings that extra touch of Vegas class to the game."

With the Wild Wasteland perk, the radio host Mr. New Vegas ends his news segment with the saying "Stay classy, New Vegas." In the movie Anchorman: The Legend of Ron Burgundy, Ron Burgundy ends all his news segments with "You stay classy, San Diego."

In the game, there is a reference to the comic "Calvin and Hobbes". In the Comic, Calvin's favorite cereal is Chocolate Frosted Sugar Bombs, which is referenced with the food item, "Sugar Bombs".

At the entrance of Nipton, a man by the name of Oliver Swanick comes up to you and proclaims he won the lottery. Later, we discover that the lottery is a death sentence, and if you fail to win, you are executed. This may be a reference to a short novel "The Lottery" by Shirley Jackson, where the winner of the lottery was stoned. This is practically the same incident, just the prize for winning altered. It can also be said that both of the lotteries are well known around town.

A lot of the content in Fallout: New Vegas was going to be featured in the cancelled Fallout 3 game being developed by Black Isle Studios. Some of the elements are Caesar's Legion, The Burned Man, and The Big Empty among others.

In Nipton, if the player has the wild wasteland perk activated, two charred skeletons can be seen with the names Owen and Beru. This is a reference to the movie Star Wars. In the movie, Luke Skywalker returns home to find his family farm on fire and the burned corpses of his aunt(Beru Lars) and uncle(Owen Lars).

On the eastern part of Camp Searchlight you can find a church with an accessible basement. Inside of the basement you can find, while having the Wild Wasteland trait, three Holy Hand Grenades (really called Holy Frag Grenades) that do massive damage. These grenades are a reference to Monty Python and the Holy Grail.

In New Vegas, there is an enemy called the Y-17 trauma override harness. The suit was designed to make sure that the person inside would go back to the base he was stationed at in the event that he was unable to himself.
However this suit has some problems. It doesn't know if the user dies, and if it doesn't have a home base, it will walk forever until it's given one.

If the player has a special perk called "Wild Wasteland", they can find odd and out of place things in the game, and when fighting this enemy you will sometimes hear them say, "Hey, Who turned out the lights?"

This is a reference to the Doctor Who episode "Silence in the Library", in which the Doctor went and found some researchers who had special suits. The suits had a function in which it would keep the user alive after he died through a link called "ghost data", and could make them speak by retaining their consciousness. One of the first people who died would repeat the words, "Who turned out the lights" over and over again since the lights inside his visor were turned off.

In Fallout 3, and New Vegas, a weapon can be found called the Fat Man, a Tactical Nuke Launcher.

When you fire it, it throws a mini nuke ahead of you at the enemy. When you reload you hear a "ding" sound to indicate it has finished reloading.

The bell heard is actually the Bethesda lunch room bell.

Indiana Jones' remains (hat included) can be found inside a refrigerator, mocking a scene in the fourth film where Jones survives a nuclear blast by hiding in a fridge.

The project director for Fallout: New Vegas, J.E. Sawyer, released a mod for the game which brings more difficulty, shifts certain NPC alignments and modifies a few character stats.

The reason this wasn't released as an official patch was partly due to its technical difficulties and difficulty curve, however it was mainly due to the development for the game and all DLC having ended.

There's a fossilized dog called Seymour in the Lonesome Road DLC. Seymour has the appearance of a normal dog, but at a reduced size. His inclusion in the game is a reference to the Futurama episode "Jurassic Bark" in which Fry finds his dog Seymour fossilized and tries to clone him.

The weapon Fat Man and its mod Little Boy are named after two atomic bombs that were dropped on Hiroshima (August 6th) and Nagasaki (August 9th) in Japan during the end of the World War II. In the Japanese version, the name Fat Man is changed to "Nuka Launcher," yet the Little Boy Kit kept its name. The changes were made to avoid offending the people of Japan, though Japanese gamers generally didn't approve of the change.

During the opening, you are shown inkblots in order to test your mental health. Fans thought that one of the inkblots looked like two bears high-fiving, but this was not an option in the game. A fan decided to make a mod for the game which made 'Two Bears High-Fiving' an option. Obsidian referenced the fan reaction and the mod by putting a character called 'Two-Bears-High-Fiving' in the game's Honest Hearts DLC.