Factual error: The Hillman Minx car seen picking up Brits at Conchin railway station is at least a 1945 model. The film is set in 1943.
Continuity mistake: When Marisa Kendall talks with her obviously arteriosclerotic mother on the phone, she holds the receiver in different ways between shots. (00:59:45)
Factual error: When they're in the bar watching the football game, after Rudy made his bet - they're supposed to be watching Denver vs Kansas City. You can see that the uniforms are not of either team (even if it were throwback jerseys). When the guy runs into the end zone, you can see the mascot of the Sun Devils on the turf, as the colors of the uniform are that of the Arizona Sun Devils.
Continuity mistake: When Gort is fixing the wheel on the man's wagon there are brown leaves stuck to it. When the shot changes to behind Gort the leaves have suddenly vanished. (00:31:45)
Continuity mistake: When Mrs. Morgan notices the peppermints, they're individually wrapped. When she picks one out, they're unwrapped.
Revealing mistake: When Terrible Tommy has Rosa in an airplane spin her hair suddenly gets thicker and her legs get thicker, indicating this is Rosa's stunt double.
Factual error: There appears to be a pickup truck parked by a barn in the background when Steve McQueen is standing by his horse, talking to Linda Evans. (00:19:00 - 00:20:00)
Revealing mistake: Linderman refuses Clifford's offer to be his personal bodyguard from Moody's gang, and leaves. As Clifford walks by the students practicing their violins, playing Mozart, their bow movements do not match the music.
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)
Continuity mistake: When Cole and the halfbreed duel with knives, the fabric they hold in their mouths as a tether keeps flipping over, meaning the end of the cloth hangs out the left side of the mouth, then the right, and left again - several times for both actors - even tho the fight is continuous and they make no moves that would change this.
Continuity mistake: When Ira and Glenda are discussing Nick, who is hiding under the bed, Ira briefly stands on Nicks right-hand pinky finger. After Ira has walked away, under the bed Nick grimaces while holding his left-hand pinky finger.
Continuity mistake: Gus Soltic at the beginning of the movie pours ketchup on the eggs. When he's done, he moves away the bottle in one shot, but it's still vertical above the eggs in the next shot. (00:02:00)
Revealing mistake: At the end of the film, it's obvious the ground that Phil falls into is just some mats dressed up in fake snow.
Visible crew/equipment: In the bar fight scene, the camera crew is visible right after Lefty hits one of the bar patrons.
Revealing mistake: In this very-low-budget but star-studded flick about UFO contactees and cattle mutilations, Jan Michael Vincent's semi-auto handgun runs out of ammo during a firefight after firing only 3 rounds (the slide locks open, indicating the magazine is empty). Without reloading or racking the slide, Vincent continues firing 5 more rounds; but we see again, in close-up, that the slide is locked open, indicating an empty magazine. (01:00:55)