When Big Mike's henchmen take a swing at the Stooges, the one trying to hit Moe misses and hits Big Mike in the chest, but the actor playing him forgets where he got hit and touches the left, then the right of his face.
When one of the henchman accidentally knocks out the other with a block of wood. Cy Schindell, via archive footage, is heard saying "I'm sorry. Really, I'm sorry, I didn't mean it.". This was to cover up him saying "boss". as Tiny Brauer played Big Mike in the original version, while Frank Sully plays the part in the remake.
Though Frank Sully plays Big Mike in this version, Tiny Brauer, who played the part in the original film, appears in archive footage, supposedly trying to play one of Big Mike's cronies, but it is obvious to the viewer that he's playing Sully's part.