Factual error: Upon completing the task of lowering every wagon, horse, mule, ox and human down to the canyon floor, the settlers proceed to build rafts for their wagons..however, their scout would have informed them that they would be going overland to intercept the Columbia River to the northwest. The Snake River, with class IV rapids, (even now tamed with dams) was no place for the uninitiated to go rafting.
Continuity mistake: When JB talks to Ms. Jones on the intercom after talking to his wife on the telephone, he asks where the "You know" is. She says "It's in your top right-hand drawer." You can see him moving to his left.
Continuity mistake: When Spencer Tracy backs into the blue hotrod, the cars end up kind of sideways. In the next shot it shows the cars at a 90 degree angle touching. Then in the next shot it shows them sideways again as he pulls away.
Continuity mistake: During the car chase, the police car overtakes the car it is chasing which then suddenly turns left. The police car brakes, then reverses and turns left to continue chasing the car. As the police car turns, there is a grey Mini parked on the right that wasn't in the previous shot and couldn't have appeared in a few seconds.
Factual error: The problem with firing a cannon on steam power is to have the boiling water build enough pressure inside the barrel, with no leaks or openings to release it before its time. The professor's scarf and the plug hammered into the fuse hole (which also flies off just before the shot) wouldn't be good enough as pressure restrainers.
Revealing mistake: During the pie fight sequence Brenda is obviously wearing a wig as her hair suddenly becomes twice as thick as it was before.
Factual error: In the final scene of the movie Elvis and Shelley Fabares are driving in his sports car along a seaside highway outside of Miami Beach. There are mountains along the coast in the background. There are no mountains in Florida.
Plot hole: At the beginning of the movie, Reese (and Walker) rob from a "drop" at Alcatraz. Reese uses that money to pay off "The Organization." At the end of the movie Brewster tells Walker the only place to get cash is at the drop. "The drop is the same but the location has changed." Brewster receives the money at the drop. This makes it clear the original drop was stealing from "The Organization." Why would Reese be able to pay off "The Organization" by stealing their own money from them?
Continuity mistake: Toward the beginning of the film, when Uncle Jim starts pouring a drink for Old Timer, he is holding the jug handle with his right hand. But in the very next shot, only a second later, he is now holding the handle of the jug with his left hand.
Factual error: In the scene when the two criminals are in the hardware store, two vehicles are parked outside that are clearly late 1960's automobiles, despite the film being set in 1959. (00:15:25)
Continuity mistake: During the dinner sequence, Angela Douglas is handed a letter. She is seen holding it with her right hand, but when the man seated next to her asks "What is it, my beloved?" we cut back to Angela and she is now holding the letter with her left hand.
Factual error: The narrator near the beginning says Al Capone was born in Italy. He was actually born in Brooklyn NY.
Other mistake: When the convoy of getaway vehicles arrive at the scrap yard, after dropping the loot of at the airfield, two of the jeep type vehicles have the same registration number - 247EJF.
Factual error: When Jeremy and Jack climb the beanstalk and arrive on the clouds, it starts to rain. Where is the rain coming from?
Continuity mistake: Alain Delon tries on some jackets. He finds a briefcase and opens it. You can see the contents of the briefcase before it cuts to a closer view; in this closer view, a stack of letters moves, and an orange case vanishes entirely. (00:27:00)
Continuity mistake: At the beginning, the scientists are told they are being sent to study the strange fact that seven meteors landed near each other in a V formation. The government agent even traces a V on the board with his finger. When they get to the field, panoramic shots show that there are nine meteors, and they are in a 3 by 3 grid, not a V.
Continuity mistake: The Packard convertible stolen at the beginning can be seen with and without a rear window during the chase scene.
Revealing mistake: In the scenes inside the space capsule, as Roy goes through the sequence, the wires holding him up in the floating sequences, and the crackers when trying to eat, are visible.
Factual error: Shortly after the scene where Robin Hood stops the pie cart there is a long shot and in the distance a car is driving from left to right. (01:00:00)
Revealing mistake: When the sky bike is flying during the competition it is obviously suspended from a crane as you can see the wires.