Other mistake: Jason's dad is still limping heavily and barely makes it to the pool table to bring the beer. 20 seconds later he's dragging an angry and non-cooperative guy bigger than he is all across the beer joint, and even tosses him out of the door as he lands with a nice graceful flip like of course any drunk dudes would. (01:03:15)
Other mistake: Tuba is back home after Rambo completely ruined the dinner at his fiancée's. During the scene, the clock on the wall has all hands still, including the seconds. (01:11:00)
Other mistake: Harry Shannon tells Mark Kaminsky that the alias he is giving him is that of Joseph P Brenner which to a guy with a long rap sheet. Paulo Rocca later asks Joey, "how the hell is it you never did any time?" (00:20:56 - 00:39:53)
Other mistake: When Turnip runs off with a horse suppository up his hindquarters, the policemen shoot at him being all in a straight line with each other - in fact it really looks like they should be shooting at each other if those guns were real. (01:05:55)