Factual error: Toshiro Mifune's character, Kikuchiyo, travels to the bandits' camp and steals one of their two remaining fuselock muskets. Shortly afterward, the bandits fire twice at the samurai within five seconds with their last firearm. A fuselock takes as much as two minutes to reload, prime, and fire.
Continuity mistake: There's an oscillating fan near the ceiling that alternates between running and not running from one cut to another in one scene.
Continuity mistake: In the barn dance scene Gideon is doing flips on the sawhorse. His shirt becomes untucked and then retucked between flips.
Revealing mistake: When O'Keefe takes his bride-to-be Dolaroo to Hong Kong to be married, a 1950's truck goes past in the background. Unfortunately, the film is set in 1870.
Factual error: The giant squid's tentacles aren't shaped like ones in the real world are.
Continuity mistake: When Johnny Friendly is threatening Charlie about keeping Terry from testifying, they are seated at a table across from each other. There is a bottle of alcohol in front of Charlie. In most of the scenes of Charlie behind the bottle, the label can be seen in full. In a couple of scenes, the bottle is turned to the right and only shows a partial label. Charlie was obviously not handling the bottle.
Continuity mistake: Caligula orders his chief gladiator to kill a prisoner so he can test the Robe's "powers". The gladiator stabs the prisoner with a dagger and straightens up. Look at the dagger and you'll see no blood on it.
Suggested correction: This may not be a mistake. It's entirely possible to stab either a person or an animal with a quick thrust and retrieve and show very little or no blood. Especially with a slim blade.
Factual error: In the shot where the three officers ride the aircraft elevator from the hangar deck to the flight deck after arriving aboard the admiral's carrier, you can briefly see some of the aircraft parked on the hangar deck, and they are jet aircraft. The aircraft have pointed noses, no propellers, and the fuselage shape and markings are consistent with first generation Navy carrier jets. These types were not in service until the mid-50s (See "Bridges of Toko-Ri").
Other mistake: In analogy to David's mishap with the champagne glasses old Mr. Larrabee crushes an olive jar when he sits down. However, in contrast to David he puts the jar into the front pocket of his pants, and olive jars don't break even if you sit on them (remember what he did to one when he tried to get the last olive out.). (01:46:55)
Visible crew/equipment: In the opening scene, Edmund O'Brien grabs a bookie, drags him down an alley, and around a corner. When they round the corner, the entire boom and mic cast a huge shadow against a stark white wall.
Deliberate mistake: After the airplane loses its propeller and descends to lower altitude, the cockpit constantly shakes due to turbulence, and the flight crew complains about it in one scene. However, when the camera switches to the passenger cabin, everything remains perfectly still and serene until the airplane is on its final landing approach near the end of the movie.
Continuity mistake: After the operation to change Vic Brady's face, the first time the bandages come off, the scar on his forehead runs diagonal from the top of his nose to well above the eye. However when he's shot by the pool, the scar runs laterally across the middle of his forehead.
Visible crew/equipment: You can see the wires leading from the planes as they attack Gojira.
Visible crew/equipment: When the mad King George III hides from Brummel and the prince behind the draperies, the boom shadow makes a prominent appearance on the wall at the top right of the screen.
Visible crew/equipment: When Henry Hobson enters shop at start of movie, there is somebody wearing spectacles hiding behind the shop counter that is covered in shoes and boots. (00:03:43)
Visible crew/equipment: When William Holden is visiting Frederick March in the Admiral's cabin a boom microphone is visible near the air conditioning ducting in the ceiling. A shadow is seen, then the microphone drops down into the shot. The microphone moves a bit and then is raised.
Continuity mistake: The two workers are being dismissed by their boss after their 'too zealant' repairs of the streetcar. Shot from behind when he stops them as they walk away, you can see him place his right hand flat on the desk, directly on the wood. Next shot and his hand is in a different position and on the papers. (00:05:30)
Plot hole: Helena is ordered to fly or be thrown off the tower, bearing the brunt for Simon's failure. But the flying apparatus is still up there, and so is her servant who was going to secretly operate it so that Simon could pretend to fly around. All she needs is right there in front of her. She's supposed to be cunning and resourceful, and she could have saved her life simply by following the original plan.