Puppet Master III: Toulon's Revenge (1991) - 5 mistakes

Revealing: When Toulon's puppet stage is set on fire, the flames in the foreground look rather like they are projected from a regularly set row of blow torches, rather than erratically flickering flames on a wooden floor.

Visible crew/equipment: When the general is killed by the six shooter, you can see the cameraman.

Revealing: In the scene with six shooter and the guy, six shooter shoots one bullet and misses. The guy grabs a gun and shoots one of his arms off. You can easily see he grabbed the gun BEHIND the wall but then he is found grabbing the gun in FRONT of the wall.

Other: Toulon dons two Nazi uniforms to make his escape. But with him as a relatively skinny old man and with his beard (since no Wehrmacht or other Nazi personnel came with nothing more than moustaches), and not to mention being recognizable via the 'Gesucht' ('Wanted') flyers, he would have stuck out like a sore thumb.

Continuity: In Puppet Master 3, when the general is killed by Six-shooter, Six-shooter fires a bullet and then gets his arm shot off, and then fires the rest of his bullets, and if you count the shots, he fires six times, and he has six arms, he fired one bullet already, plus his arm was shot off.