Factual error: When the B-52 is flying low over Russia, the shadow on the ground is a Boeing B-17G, a World War II propeller driven bomber.
Continuity mistake: The father tears the children's advert for a nanny up into 8 pieces, but when it comes out of the chimney it's in far more bits.
Continuity mistake: There is a scene in the movie where the Beatles enter a limousine, I believe at the beginning of the movie. In this particular scene the Beatles are all dressed in suits and ties, but when the Beatles are filmed in the limo, John Lennon is wearing a turtle neck sweater beneath a blazer.
Continuity mistake: When Dr. Morrissey comes to George and Judy's house on Sunday night after the fishing trip to bring them some fish, he sits down on the couch and removes his glasses. Then, in the next shot, his glasses are back on again. He wouldn't have had time to put his glasses back on. (01:09:45)
Other mistake: Subtitle (English) appears to be incorrect: "He is setting the scions of criminal investigations back 1000 years" should be "He is setting the science of criminal investigations back 1000 years." "Scions" is a description of the branches of a tree. (01:11:00)
Revealing mistake: When the genie (Burl Ives) moves the fire plug you can see a bracket holding it up and running down to a track beneath it.
Revealing mistake: Near the beginning, Hengist and Horsa are watching a young cave couple dragging each other around. Hengist is pouring Horsa a drink and you can see him pour, raise the jug, then Horsa takes a sip from his cup. All this time it is patently obvious that no liquids are in the vessels.
Continuity mistake: Ann Margaret is seen dancing with high heeled shoes at the beginning of a dance routine and during the routine is seen in flat ballet shoes, then near the end she is seen wearing high heeled shoes again.
Visible crew/equipment: In the beginning, when Dino is stopped by the police, the stage lights are reflected on his sun glasses.
Continuity mistake: When Marlon Brando's character demands 20% of the con game proceeds, David Niven points at him with a cigar he holds in his left hand. But when the shot cuts to a different angle, Niven's hands are both instantly in his robe pockets, and the cigar has disappeared. (00:42:30)
Continuity mistake: At Molly's party after returning from Europe, the Duchess is introduced, and everyone bows. The shot shows Molly reaching for her neighbor who's standing straight, to bow down, and she does. Then there is a long shot showing the crowd, and the neighbor is again standing, and then you see Molly reach out for her again as she just had.
Continuity mistake: When the fire engine leaves the Pilsbury Pageant, you can see that there is a blue mattress and a pink blanket on the back of it, but after running over the puddle and covering Mr Chipfield in mud, we cut back to the fire engine and the pink blanket has disappeared.
Continuity mistake: When the initial site team comes to the Tatum's, the second jeep in the convoy has the same supposedly unique serial number as the one the general arrives in a week later.
Revealing mistake: When our heroes are on the conveyor belt which carries the rocks towards the spinning saw blades, the rocks which get cut in two are seen to be cut before they reach the blades. (01:20:45)
Continuity mistake: When Speedy is standing in the doorway of Pancho Vanilla's hut, you can see there is nothing behind him on the drive, but in the next shot more flat stones have appeared.
Continuity mistake: When Bruno goes to the Captain, to ask for leave so he can go to his daughter's funeral, he places his cap on the desk in front of him. It slips to the floor, but a minute later his cap is magically back on the desk.
Factual error: The radio Walter uses on the island has no apparent power source; we never see either batteries or a hand-cranked generator.
Continuity mistake: When Shirley Maclaine goes swimming in the blue lagoon, her hair is all wet before she enters the cave, but once in the cave her hair is only wet on the ends.
Continuity mistake: When Sammy Davis Jr. is shooting up the casino, the glass rectangles for the lights on either side of all the wine bottles have machine gun bullet holes in all of them before he shoots.
Continuity mistake: When the clerk looks in close-up at the bank cheque written in disappearing ink by Fantomas, the background has nothing to do with the desk, and the distance is all wrong as well. (00:03:10)