Hi, £e Nécroyeur!
There's a glitch in Final Fight, 3rd stage, right before fighting the Andores, that could maybe be useful in a two players run. If you stand with one character on top of the dustbin that contains food while the other triggers the cutscene where the Andore grabs one of the characters, you have an interesting glitch.
I'm posting 3 movie files:
ffight3rdstageNormal: Just for comparison, this is how this part was supposed to be.
ffight3rdstageGlitchedSlow: If Haggar is standing too close to the door, the cutscene actually takes longer than it was supposed to.
ffight3rdstageGlitchedFast: Now, if Haggar is further to the right the cutscene is interrupted over 3 seconds earlier.
Cody has to be in such a position when he lands on the dustbin that when he jumps to the left he get's trapped in something like an invisible wall, so he just can't go to the left.
Final Fight 3rd Stage Cutscene Glitch