Easter Eggs

Here are things that are known for hidden secrets, references and more.

Modern Era
Over 9000 wig is a reference to a popular meme, ITS OVER 9000!!.

The Diamond Block made an appearance from Minecraft.

Desk of Thrones is a pun to the Game of Thrones.

A similar Goal Pole made an appearance from the Super Mario series.

The Priceless Art shows an art of Mona Lisa.

Homer's Donut made an appearance as a Room Item.

2 terminoes from Tetris made an appearance as a Room Item.

Prehistoric Era
Pedal Powered Cars (the vehicle looks identical to a Flinstones car)

Identical Poster (one of the reinvest posters looks identical to batman's logo)

Dungeons and Bitcoins
Hey! Listen!, Thrice Force and Green Guy's shield is a reference to Legend of Zelda

Frosty made an appearance in one of the achievements and let it go already is a reference to a Frozen song, Let it Go.

Fus Ro Desk is a pun to Fus Ro Da!

SkyRAM is a pun to Skyrim

Others
Jason's mask made an appearance as your character's mask from the Friday the 13th series

The Grinch made an appearance as a mask.