In Metal Gear Solid 3: Snake Eater, the Cobra Unit member "The Fear" uses a crossbow in battle and coats his bolts in the venom of the Brazilian wandering spider. Snake is hit with a bolt in a cutscene and The Fear describes the effects of the venom. However, one effect wasn't described by The Fear and wasn't displayed in the game at all. As well as causing intense pain, the venom has similar properties to Viagra, giving the victim an erection.

If the player saves their game while in the Groznyj Grad jail cell after the torture sequence, Para-Medic will talk with Snake about the movie Dracula. If this save game is loaded, Snake will have a nightmare about a vampire, which is represented as a playable demo sequence of "Guy Savage", a cancelled Konami game.

In Metal Gear Solid 3, you hear about a legendary sniper called "The End". He apparently can never miss a shot, will always kill his target no matter what from any distance, and without a spotter.

What isn't known is that his parrot is his spotter. If the player shoots the parrot in the battle, he has a harder time shooting you. He also becomes enraged.

When you meet with Major Ocelot at Bolshaya Past Crevice, equip your Single Action Army Revolver, and begin to use the right analog stick to twirl the revolver. A hidden cut scene will occur where Ocelot will come out and twirl his revolver as well, and show off his freestyle tricks.

When you fight Major Ocelot, unequip your weapon, and stand out in the open for a few seconds. A hidden cut scene will occur where Major Ocelot accepts your challenge, and comes out for a quick draw duel.

In the "Snake vs. Monkey" mode, you play as Solid Snake (unlike the rest of the game) and during the radio call in the beginning, Snake suggests that Sam or Gabe could take the mission. This is a reference to Sam Fisher and Gabe Logan of Splinter Cell and Syphon Filter, respectively. Splinter Cell and Syphon Filter were Metal Gear's two biggest competitors during its release.

If the player saves their game at the beginning of their fight with The End, and then changes the PS2's internal clock to a week into the future, then resumes the fight, The End will have died from old age.

In Chinese, Big Boss's name is Tai Pan. Which can mean a foreign "Big Boss" or "Big Shot", but Tai Pan is also the name of one of the most dangerous families of the snake species in the world.

On the second disc of MGS3 Subsistence, there is a hidden "blooper reel" of alternate cut scenes. Most of them don't make any sense and are simply intended to entertain those who find them.

If you enter the cure mode and rotate Snake for a while, he will vomit upon exiting the menu.

There is a way to kill The End before you even fight him. If you swim to a hiding place across from the Ponizovje Warehouse, you are in a perfect spot to snipe him. If you do kill him this way, Zero and the other support team members will congratulate you for killing him, although Snake will express disappointment in killing him in the manner that he did, as was hoping that he'd actually face him in battle. If you do this in the HD Collection, you will get an achievement called "The Early End."

If you wait for a few seconds after getting a Game Over, the text will slowly change from 'Snake is Dead' to 'Time Paradox'.

If you knock Ocelot out and then kill him, you'll get an automatic Game Over with an 'Ocelot is Dead' screen. You'll also be told, "Snake, you can't do that! The future will be changed! You'll create a time paradox!!"

While fighting The Sorrow, if you call people on the codec, they will speak as if you were at the death screen.

A way to get the Single Action Army Revolver on the next playthrough is to choose the wrong gun in Snake and Ocelot's Russian Roulette duel.

Shooting Eva with the Mk.II Hush Puppy as she sleeps will cause her to mutter explicit things including "mmm, right there...", "Snake, that feels so good..." and a phrase referring to The Boss, "Boss, that feels so good..." She would also mention her dog.

In the "Health History" menu for Eva, it shows that she had procitis inflammation in the rectum, and also reveals that she had breast enhancement surgery.

The Virtuous Mission take place in August 24, 1964. This date is also Hideo Kojima's 1st birthday. Kojima wanted to use his birth year, but moved that date forward a so that the Kennedy assassination could be included in the story.

Snake VS Monkey is a mode where the player plays as Solid Snake (judging by references to Otacon and Metal Gears as well as Snake talking with Campbell) wherein the player must catch the eponymous apes from Ape Escape. This mini-game was not included in the 3DS version or the multiplatform HD Collection, likely due to Sony's ownership of Ape Escape.

During the phone-call scene between President Lyndon B. Johnson and Premier Nikita Khrushchev, Johnson mentions that the Russians refer to The Boss as "Voyevoda."

"Voyevoda" is a Russian word for "warrior", "knight in training" or "leader of an organisation", and can refer to someone in the military or government with a degree of power. When used in regards to a female, it can also mean "lady knight." As Russia has had a number of famous queens in its history, this is considered a highly respectful nickname for The Boss.