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)
Other mistake: In the opening credits, Manuel Perez's first name is misspelled as "Manual."
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.
Factual error: In the film, Houdini's family name is Schwartz. In reality, it was Weisz.
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)
Character mistake: The hand bill identifies the company as Slipp-Skipp and Tripp. The sign on the door says Slipp, Tripp and Skipp.
Continuity mistake: Mickey Mouse is wearing a hat and fishing when a seagull lands atop his hat. The seagull is facing Mickey's right but when Mickey looks down to see their shadows, the shadow of the seagull shows him facing Mickey's left.
Continuity mistake: Before Elmer runs off to fetch his gun, you can see there is a carrot near his feet on the ground. But when he returns, the carrot has gone.
Factual error: As the team practices, the film shows the passage of time by using a calendar. The month of July ends on Thursday, the 31st, but August the first is shown to start on Wednesday.
Continuity mistake: When Donald is sweeping the peanuts in front of Delores the elephant, he picks a single peanut off the floor and you can see there is nothing in front of him, but in the next shot a pile of peanuts has suddenly appeared.
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 Foghorn Leghorn lifts the wired fence with his foot to let one of the chicks out, you can see there some chicks by his foot when he lowers the fence down, but in the next shot the chicks have disappeared.
Continuity mistake: When Bugs bends Toro's horns on the bull shield, the horns change position between shots.