Still not sure if there's a more specific place for noting bugs, but 1: Rouge's special will not stun or knockback Chief Grounders(blue), but will still deal damage(only affects Rouge's special), 2: the Monkey Futas are missing or incorrectly reading audio, replacing part of it with the "Escape!" line on repeat(only found on Tails, not tested with other characters), 3: the crystal secret in the same stage will not spawn all 3 crystals correctly, initially only spawning the left and down ones. Triggering the 'WRONG" line will cause the 3rd one to spawn, but hitting the 3rd crystal may incorrectly register as hitting a different crystal, making the pattern more difficult (not sure what I did different that made it work the last time, but I did eventually get into the secret)
Lastly, not sure if the pterodactyl enemies have an attack, but if they do, they do not do it, maybe due in part to enemies being unable to attack when they are not onscreen