If you name a Mob creature "Dinnerbone" or "Grumm" (using a name tag) the creature will flip upside-down. This is an Easter egg put into the game by the developers, Nathan "Dinnerbone" Adams and Erik "Grum" Broes.

Some of the paintings in the game are maps from the game Counter-Strike.

Five humanoid mobs which were available in the Indev version were later removed. However, they can be found in the files of earlier versions of the game. The mobs were Beast Boy which resembles the DC comics character of the same name, Black Steve, humans which resemble the default player's character (later renamed 'Monsters'), Rana who is a little girl with a frog hat, and a different human also named Steve.

Notch tweeted a mysterious picture that, when brightened, revealed a player to be "flying" on a cloud. This was a scrapped idea for flying in creative mode, which was implemented in version 1.8.

Diamonds were originally called Emeralds. Because of the light blue color they had, Notch decided to change the name to diamonds. In the code of Minecraft, Diamonds were still referred to as emeralds until 1.3, which introduced the current item known as Emeralds.

Gears were a type of block that were available in Indev 0.31 which could be used in a similar way to redstone. They could only be placed on the side of blocks, and were never available in the release versions. In earlier builds players could hack the game to make them accessible, but the files were removed in later updates.

The Leather chain armor is a sprite from Indev (an older test version of Minecraft's Survival mode) 0.31's items.png armor. It never made it to the release versions.

In the InDev version of the game, Notch may have planned to have furniture in the game, as found in the terrain.png inside the Minecraft Indev files. The idea was later abandoned.

Bedrock was originally known as "adminium" because it was only allowed to be broken and placed by admins.

When Beta 1.4 was released (April 1st, 2011), there was a small chance of every chunk spawning a block that is now called "Locked Chest" which, when right-clicked, displayed a menu saying "Steve Co. Supply Crate". This is a nod to Team Fortress 2's Mann Co. Supply Crates. Clicking the "Go to Store" button opened a browser window to the newly created Minecraft Store, which sold 12 items:
• Steve Co. Supply Crate Key ($3)
• Steve Co. Supply Crate Key 5-Pack ($18)
• Miner's Helmet ($21)
• Name Change ($99)
• Creeper Saddle ($42)
• Secret Griefer Identity ($155)
• Enlargement Pill ($2)
• Response From Support ($494)
• Three "Coming Soon" items (Priced at $75, $7, and $1499)
• "Regular Padlock" for $8.

Items could be "purchased" by clicking on them. Once the cart reaches $10,000 worth of items, a pop-up appears advising you to click cancel if you're prone to seizures. If you click OK, the screen starts flashing various colors.

Clicking the Checkout button caused a Velociraptor sound effect with an error in the "checkout" process. On April 2nd, a banner was added which floated the words "April Fools!" across the screen, accompanied by a midi instrumental of Rick Astley's "Never Gonna Give You Up".

The "Locked Chest" item was meant to be removed on the midnight of April 1st, but since the creator, Markus Persson, was sick, the item was removed on April 5th instead, the day Beta 1.4_01 was released.

According to Notch, The Enderman name is a reference to the creepypasta monster, "The Slenderman".

Endermen sounds are actually a person saying "Hi" and "What's up" played backwards and distorted.