In level 3-2, Button Bash, there's a stone monkey which opens up its mouth for you to go into. The monkey is wearing a tie that somewhat resembles the American flag. This tie is a reference to the tie worn by professional gamer Billy Mitchell, who held the world record for the top score in the Donkey Kong arcade game. This Easter egg remained in all later re-releases of the game despite a legal controversy between 2018 and 2024, where record keepers temporarily removed his Donkey Kong score among others and contested their authenticity.