Other mistake: In the opening credits, the composer of the movie score is credited as "Elizabeth Lutyens", with a Z. Her proper name was Elisabeth, with an S. (00:00:50)
Continuity mistake: When the prostitute is reflected in the mirror, her kimono bares one of the shoulders. She turns, and both shoulders are covered. (00:08:55)
Revealing mistake: During practically every scene with Dr. Nadir, the prosthetics to make his cranium look more 'alien' are visible. In particular, when the Queen realises he's been shooting down spaceships and not missiles and calls him a 'fool', at the back of the neck the line where the concealing make-up ends is evident. Throughout the rest of the movie the other Martians have similar if not even more obvious bald caps. (00:17:45)
Revealing mistake: When Phil kills himself by throwing himself off the roof, in the shot of him supposedly hitting the ground it is painfully obvious that it is a dummy. Not only does it hit the ground completely rigidly but the wig on it even noticeably flies off on impact.
Other mistake: Dean Jones and Connie Stevens are riding in a gondola of a skyway ride at a seaside amusement park. The gondola they are in is obviously on a studio soundstage. It is much larger than the gondolas shown in the rear-screen projection. In addition, there are no riders in any of the other gondolas and the gears and cables of the ride make absolutely no sound.
Continuity mistake: In the animal mortuary, Robert Morse opens a refrigerator with two dogs in it as he reads from a book. When he returns to that same refrigerator seconds later, the dogs are gone, replaced by a crumpled white cloth and a cat. (01:01:30)
Factual error: Rifles and more so, cannons of the type shown in the movie were not close to being invented in the 1500s.
Continuity mistake: When the janitor sweeps the floor litter into the tiger-skin rug, the Pink Panther ejects the litter and you can see that the janitor's sweeping brush and litter are by the rug when he runs off to fetch a gun. But when the janitor returns with a gun, the litter and sweeping brush have disappeared.
Other mistake: FBI Agent Kelso believes a cat may be able to lead him to the location of a kidnapped bank teller. He has four other men trying to follow the cat. When Agent Cahill reports that he is stationed "west of Whittier Street," Kelso sticks an identifying pin on a large map but he puts the pin in a location east of Whittier Street.