Continuity mistake: In the scene where we see the room from a wider shot there is no rifle leaning against the barrel. We then get a closer shot of a man talking and there is now a rifle leaning against the barrel.
Other mistake: Just after the Royal Navy destroyer has sailed through and depth charged the area where the British survivors are, there is a shot of the churned up sea with sombre music playing, and the seagulls are flying backwards.
Revealing mistake: In the scene where Lancelot runs into and fights Arthur's ambushers, he runs one of them through with his sword. It is visible that he stabs his opponent past the body, but close enough for the appearance.
Continuity mistake: After 1st Sgt. Milton Warden breaks the bottle to stop the fight between Pvt. Angelo Maggio and Sgt. James R. "Fatso" Judson, he throws the bottle in a corner. In the next shot, he's sitting down with the broken bottle on the table in front of him.
Other mistake: In one scene Tyrone Power and his men survey a village where all the inhabitants have been killed by rebels. A dead boy is on a table and as the camera pans back he is wriggling his toes.
Visible crew/equipment: John Payne leaves a theater after getting into a fight after being tricked by actress friend Evelyn Keyes during an audition. As he walks out the backstage to the back entrance, the shadow of a crew member (possibly the camera operator) can be seen on the wall as Payne passes by. (00:31:00)
Continuity mistake: When Bugs is standing in front of the General's desk, the General has nothing in his left hand but in the next shot he is now holding a pencil.
Visible crew/equipment: After JD tells Schatze that Tom came to the wedding and he isn't wearing a tie, just as Schatze says, "Who does he think he is anyway, crashing my wedding," we can see the shadow of the boom mic drop into view on the wall, at the left side of the screen. (01:27:55)
Factual error: In the scene where Marcellus is being shipped off to "Palestine" on the galley - presumably from Ostia the port of Rome at the mouth of the Tiber - he is urged to hurry up his farewell to Diana by the galley captain because "we will miss the tide." This is the Mediterranean - there is no tide to speak of.
Other mistake: In the opening credits, Manuel Perez's first name is misspelled as "Manual."
Factual error: In the film, Houdini's family name is Schwartz. In reality, it was Weisz.
Continuity mistake: When Bugs Bunny closes the door on Daffy Duck at the end of the cartoon, Bugs is holding his pencil upside down, but in the next shot he is now holding it the right way up.
Continuity mistake: Lieutenant Bowers questions the survivor of the first encounter with the alien, suspecting he might have just clobbered a love rival. The telephone rings; after it happens, the sheet in front of the suspect does a 180°. (00:09:35)
Continuity mistake: When Sam is walking to the door of Emma's house, he is holding a box of chocolates in his left hand and a bunch of flowers in his right. When Emma opens the door and sees Sam, the chocolates and flowers have changed position.
Continuity mistake: When we see the park where the wild cat is hiding, there is a sign saying "No Le Pate de Fois Grass", but when we see the sign in the next shot, the "Le" has disappeared.
Continuity mistake: When the psychiatrist sees the elephant drinking his glass of water, the notepad he is holding is half filled with writing. In the next shot, the page is completely full.
Character mistake: On the sign outside Dr I.Q. Hi's headquarters, the word "Stratosphere" is spelled "Stratopere."
Continuity mistake: When Donald uses Delores' trunk to suck up the peanuts that Chip and Dale are holding, you can see in the background there is a brick wall, but in the next shot the background has changed to the zoo.
Continuity mistake: When Pluto goes to show Mickey the mussel stuck in his mouth, the items inside Mickey's lunch box change between shots.
Continuity mistake: When Tom removes the packaging, you can see that it reads "Life with Tom by Jerry Mouse" on the front cover, but when we see Tom reading the book later on in the cartoon, the wording has disappeared.