Plot hole: Kane and Irons abandon their horses to hook a ride on the train, leaving behind their rifles. When they get to Hadleyville, Kane has somehow reacquired his Sharps.
Other mistake: Someone in the film discusses being "stabbed with a gun".
Factual error: The middle third of the film recounts Dr. Thompson meeting Laszlo at the 1972 Superbowl (VI) in Los Angeles, however, in 1972 the game was played in New Orleans.
Continuity mistake: In the bullfighting scene Herbie's driver-side running board is dented upward in the middle, but in the following scene it isn't there.
Continuity mistake: Popeye goes to Bluto's ship. He finds his pappy there: he's tied to the chair hanging in the ceiling. Popeye gets excited, and notice that before he hugs his pappy he takes his pipe out of his mouth. When we see Popeye again, the pipe is back to his mouth. Too fast to be real.
Continuity mistake: When François starts talking to Coco in the cafe, the donut on her plate and items on the bar next to her keep moving between shots.
Other mistake: Near the end of the movie, Dave Speed jumps onto Torpedo's private plane and starts steering it to the ground. The plane is white with obvious red stripes. However, Dave Speed is supposed to lose his super powers when he sees red.
Continuity mistake: At the end, the buried biker digs himself out of his grave and shuffles to the smokehouse. When he attacks Farmer Vincent, all the soil and mud stains have vanished from his clothing. Guess he must have stopped off at Zombies-R-Us for some fresh new duds. (01:30:00)
Continuity mistake: When Garland (Slim Pickens) finds out about the affair between Buck (Willie Nelson) and his daughter Lilly (Amy Irving). He takes a cab to the beach where Buck is hiding out. When Garland steps out of the cab, the bottle of tequila his is holding has just a little tequila in it. In the next scene when he is paying the driver the bottle is half full, and the next scene the bottle is almost completely full.
Factual error: In the ambush-on-the-prison scene, one of the Boers is equipped with a Lee-Enfield CLLE Charger-Loading Rifle. Although the Boers used many captured Lee-Enfield and Lee-Metford rifles, the CLLE's weren't even developed until the Boer War had ended.
Revealing mistake: The cannibals kill Faye, and then decapitate her. Then one of the natives lifts her head up, only to let the wig slide off of the fake head, and reveal a yellow foam head underneath.
Continuity mistake: When Julian Kay is tearing apart his Mercedes to look for the stolen jewels, he is seen pulling some plastic off the driver's door, in the next shot, you can still see the plastic attached to the car door.
Continuity mistake: In the bus scene at the beginning, the little girl with braces (played by a nonspeaking extra) is seen at the front of the bus, on one side of the fight. Then she is seen near the middle of the bus, on the other side of the fight.
Visible crew/equipment: When John is playing the piano, after the door opens by itself in the music room, there is a shot that revolves around him. If you look in the large mirror in front of the piano you can see the pole of the boom microphone reflected (behind the chandelier). (00:19:21)
Audio problem: When the Kelvin sacrifice themselves in front of the Sonic Tank, Cowboy walks off and says, "C'mon, lets go", but his lips don't match what he says.
Factual error: It is established early in the movie (Natalie's call) that the money ball event celebration is part of the -first - anniversary of the Valley River Center, the shopping mall where most of the movie is set, with the town of Eugene, Oregon, mentioned explicitly. However, the center opened in 1969, and the movie is set in 1980. The original script was written in 1971, so that line needed an update and slipped by.
Continuity mistake: When the ladies are speeding down the streets, on the way to the hospital, Jane Fonda's coat belt hangs out the bottom of the door, or isn't there, depending on the shot.
Continuity mistake: In the last scene, the Butler and Groomsman load a Sarcophagus in the back of their station wagon. The tail gate is left open and both step back as the vehicle pulls out. As they are driving off down the driveway the tail gate is closed.
Factual error: When the Peanuts gang got to Victoria station, Travel Center is spelled the American way. Since it's England it should be "centre" (00:24:55)