Each character is tied to a specific controller: Red 1, yellow 2, blue 3 purple 4. if you try to do something like this Red and Blue it will default to Red and Yellow because of how controller pairing is currently being done.
Sometimes there's a rare bug of stunned rates causing you to stay perma stunned. Doesn't happen often but I've seen it happen 1 out of 10 play tests. Goes away after getting hit or knocked out.
Fireball will launch you in opposite direction sometimes.
If you're hit by the fireball and you are still on stage, you might fall through stage.
Camera wonks out every now and then.