I think this is interesting, MK related Easter Egg,s:



This is from the game "Judge Dredd" wich never released in the Arcades, it,s "Final Fight" gamestyle.
But there is a beta version aviable for MAME.
In the very first stage you can see Goro as a pet.




Ever asked in what strange thing Shang morphed in his Friendship?
Its the Rider from Joust, an old Classic Arcade game from Midway




PacMan and a Ghost is hidden in MK1!
PacMan is original from Namco, but Midway has developed 1 version too.