Serpentor:
There can be no negotiation, you insignificant microbe!
Audio/visual unsynchronized: When Sgt. Slaugher shouts "Yo Joe! Let's stomp snake!" it is clearly the wrong voice.
Continuity: Airtight disappears and reappears randomly during the rescue mission for Sgt. Slaughter.
Edited from
"G.I. Joe" (1985)