Continuity mistake: Gator's brown Ford sedan alternately does and doesn't have rear bumper guards during the first moonshine chase. (00:40:10)
Visible crew/equipment: The morning after the bar shooting, when Charlie and Johnny Boy are in the apartment, we can see the outlines of the hidden mic wires at the front of both of their undershirts, as well as the bulge of the mic transmitter at the back of Johnny's waist. (00:50:35)
Visible crew/equipment: When Kananga and Bond are fighting a cable protrudes under Kananga's jacket, it even lifts up his clothes. Seemingly the mic cable. (01:54:27)
Continuity mistake: In the scene where Serpico is in his apartment speaking to his girlfriend explaining how hard it's been to be an honest cop, he is drinking what appears to be a full glass of white wine. In the following shot of the both of them, Serpico sets up two unused glasses, opens a bottle of wine and pours it into the two glasses. His original full glass of wine is nowhere to be seen.
Continuity mistake: When Christopher Lee in drag is leading the procession towards their mini-stonehenge, look at the dolmen the villagers go through; the shadows vary significantly direction in the space of a cut.
Continuity mistake: In the village of Maiberra, two baddies dismount from a truck. You can see by the truck a series of women sitting against the wall. Shaft and his bodyguard arrive mere seconds after, but the natural light changed (look at the shadows on the wall), some women left and the curtain has been moved. (00:51:15)
Continuity mistake: When Lt. Snyder breaks the phone booth window with his gun and points it at Hooker, Hooker's hat falls off. Yet in the next shot over Lt. Snyder's shoulder you can see that Hooker's hat is back on his head.
Continuity mistake: Rizzo breaks up the rumble at the pizza joint; in the wide shots when he keeps the goons in check, there are several more unperturbed bottles in the shelves behind Manomozza than in close-ups. Some of the bottles that were in the side shelves in fact have inexplicably moved onto the center one. (00:11:25)