Revealing mistake: When Sonny is punching Carlo under the spraying fire hydrant, he misses an audible punch by at least six inches. (01:43:30)
Revealing mistake: In a scene where the canoes are shooting the rapids through a sheer cliff you can clearly see a stuntman climbing out of the water onto the rock.
Continuity mistake: Gene Hackman and John Shea are both doused with water when they come out of the restroom. In the next shot, their hair is completely dry.
Continuity mistake: When Lawrence Olivier and Michael Caine are playing snooker, Olivier pots the black. There is then a wide shot, with the black visible again on its spot. The next shot is a close up of Olivier picking the black ball from the pocket and replacing it on the table.
Visible crew/equipment: Near the end of the chainsaw sequence, a crewmember's hand is visible on Krug's back.
Continuity mistake: Watch the bar scene about ten minutes from the start of the film. The barmaid is holding 2 pints, but note how the froth disappears when the shot changes as they are placed on the bar.
Continuity mistake: After Bruce Lee kills Chuck Norris, he walks back and picks up Chucks Gi and Obi (karate shirt and karate belt). The belt is hanging and dragging on the floor but as Bruce walks from behind a column, the Obi appears to be folded properly.
Continuity mistake: At the end of the film when Oliver Reed is in the Range Rover and ramming the Hillman Avenger, watch the number plate of the Avenger. It switches repeatedly between a 'K' suffix and a 'J'.
Audio problem: When Bruce Lee finishes fighting with the Japanese school using a nunchaku and is going to fight with the fat man, he folds the weapon and tosses it to the floor on his left. It lands without making a sound.
Factual error: The colt .45 that Telly Savalas uses didn't come into use until 1911 (the film's set in 1909).
Continuity mistake: In the warehouse scene with the vampires, none of the oil lanterns thrown were lit, but the oils were ignited when they smashed. One shattered on the ground in front of Bobby, who moved away from the flames, but he was on fire a second later. (01:14:29)
Revealing mistake: During the flashback sequence when Gunbei's double is decapitated, his severed head hits the floor but you can see that the actor's head is still inside his clothing. His top has been pulled over his head to make it look like his head has been cut off. It's even more obvious in the wider shot right after. (00:27:42)
Continuity mistake: The mafioso with the rainbow scarf hands his boss a drink, extending his arm. The next shot begins with his arm bent, and the third mafioso acting as barista is also in a position inconsistent with the previous shot. (00:15:00)
Continuity mistake: Pickett Smith has his shirt sleeves rolled up at the movie's beginning, then they're rolled down and buttoned then rolled back up before his canoe gets knocked over.
Continuity mistake: When Abel rams the sheriff's car, he is driving a 1966 Chevrolet. He leaves and ends up at the veterinary clinic, where the doctor injects him with a poison. During the following chase, Abel's car becomes a 1967 Chevrolet, then reverts back to the '66 Chevy.