* In AttractMode, press and hold A, B and C. Sonic will go in the wrong direction, refuse to jump and in some cases voluntarily kill himself.
* What Dr. Robotnik does [[TheStinger after the credits]], depending on whether you collected all the Chaos Emeralds or not.
** If you missed at least one, Robotnik stands on top of text reading "TRY AGAIN". He grins at you while juggling the remaining emerald(s).
** If you collected them all, Robotnik [[AgitatedItemStomping angrily stomps on the "END" logo]] repeatedly.
* The commercials for the game:
** [[https://www.youtube.com/watch?v=Fv1aztwV8Ro One commercial]] features the president of [[FunWithAcronyms Humans Against Genesis]] complaining about Sonic's character, asking "Why can't he be more like that nice boy, [[Franchise/SuperMarioBros Mario]]?" As she does this, Sonic mocks her from inside the framed picture and runs away when she tries to grab him.
** In [[https://www.youtube.com/watch?v=mK0OFsWWzu4 another commercial]], a salesman is at a video game store, trying to sell the then-newly released Platform/SuperNintendoEntertainmentSystem with the ''VideoGame/SuperMarioWorld'' game to a customer for $199.95. The game is shown alongside a Sega Genesis playing ''Sonic'', and unfortunately for the salesman, the game's fast action and the Genesis' price of $149.99 manage to convince the customer to buy ''Sonic''. This commercial even [[https://www.youtube.com/watch?v=oiFgaatXuRc got homaged in 2018]] to promote ''VideoGame/SonicMania Plus''.
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