Revealing mistake: The stepmother's arm disappears for a split second when she tells her daughters that there is still a chance for them to become the princess.
Continuity mistake: Doc Riedenschneider calls on Cobby in a dark hallway with brick walls and a door in the end with a half-open transom. Through this door, in the adjacent room, there are several gangsters seated a table. They go down the hallway and enter this room. In the next scene they have entered and the seated gangsters are suddenly no longer there. Nor is there a transom over the door. The hallway viewed from this room has white walls now instead of brick.
Visible crew/equipment: When Joe Gillis returns to the mansion, after Betty Schaefer has just revealed her love towards him, when he enters his room, you can see a hand wearing a watch in the mirror. (01:26:50)
Other mistake: A glass is dropped which had drink and one ice cube in it, however two ice cubes are picked up from the spillage.
Factual error: Between Earth and the Moon the crew of the spacecraft have an EVA in which they walk on the ship's metal hull with magnetic boots. At one point an astronaut inadvertently slips both boots off the hull and drifts off into space, helpless. There is a long shot of him drifting away in which his body spontaneously spins around 180 degrees and then stops rotating, which is all a violation of conserved angular momentum.
Visible crew/equipment: You can see Dean Stockwell's harness and guide wire when Kim is hauled off the ledge and up the cliffside.
Continuity mistake: Veta and her daughter are getting out the tablecloth. The daughter mentions Harvey's name and Veta shushes her. Cut back to the table being visible. In seconds, the tablecloth goes from barely unfolded to neatly spread out and straight.
Visible crew/equipment: When Fabian goes into his office after receiving the package, he closes the door and the rest of this shot is through the glass. The camera and its operator (with a white shirt) are visible on the right side.
Continuity mistake: In the scene towards the end of the film, when three troopers creep into the church, Margaret Mary hits Sandy over the head. When Margaret Mary starts to speak, a ribbon around her neck curiously unravels itself and disappears behind her back .
Revealing mistake: In this scene we see Claudette Colbert and her husband talking. In the background it's obvious the ocean scene is a stage prop, the waves in the sea don't move at all.
Revealing mistake: Having been deserted by their porters three white people and a native journey on. During their journey an antelope is shot by Allan Quartermain for food. The sound of the shot is dubbed in as there is no recoil from the high powered rifle he uses.
Continuity mistake: When one of Rocky's henchmen places Daffy back on his bed after the swimming pool scene, Rocky tells Daffy no more stalling and you can see the henchman is by Daffy's bed. But when Rocky walks up to Daffy in the next shot, the henchman has gone.
Continuity mistake: When Sylvester runs into the Broken Arms Apartment Building, you can see the front door of the entrance has nothing on it, but when Sylvester is being attacked by the guard in the next shot, there are metal bars on the door.
Continuity mistake: After Bugs Bunny has snipped off Elmer Fudd's pants suspender buttons, you can see Elmer's gun is directly behind him. But when Elmer picks up his gun to try and shoot Bugs, the gun is now by his foot.
Continuity mistake: When Tom traps Jerry in the blinds, he pulls the cord and squashes Jerry. At this point, you can see Tom is holding the cord, but when we Jerry sliding down the blinds in the next shot, Tom is no longer holding the cord.
Factual error: This Warner film concerns a pair of post-Mexican War, new-style percussion revolvers stolen from a travelling arms dealer and used in a crime spree. The criminal was unbeatable because of the overwhelming firepower of the guns compared to the single-shot handguns used by everyone else in the film. The title guns used throughout the film were a pair of Colt Dragoon revolvers, in caliber .44. Colt didn't manufacture a .45 revolver until the metallic cartridge era, in 1873.
Visible crew/equipment: During the dance scene, in the ladies room the shadow of the boom mic is seen in the mirror's reflection behind Ann. (01:10:00)
Continuity mistake: When Porky inspects Prissy for eggs, you can see that the nest to her has nothing on the wall, but when Porky threatens Prissy to lay an egg, a sign with "Daphne" on it has appeared.
Continuity mistake: Dr. Luther Brooks is in the changing room with Dr. Dan Wharton. During their conversation, one of the lockers behind Brooks' is open, its door quite close to him. In the close-ups though, all the lockers are closed. The shadows are also different. (00:04:00 - 00:04:40)
Continuity mistake: In the scene where Sylvester tells the bulldog to be quiet when they are in their cages, you can see there is nothing behind them, but when we see the train about to go up a hill, we cut back to Sylvester and crates have suddenly appeared.