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: 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 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.
Character mistake: On the sign outside Dr I.Q. Hi's headquarters, the word "Stratosphere" is spelled "Stratopere."
Continuity mistake: When Sally is disturbed by the resemblance of her friend, who was recently killed and then her body was stolen from the morgue, to the wax figure of Joan of Arc, she reaches up to touch the left side of the face, but when Vincent Price turns up, she is touching the right side of her face.
Continuity mistake: When the elephant walks up to the bowl of clothes pegs, the number of pegs in the bowl changes between shots.
Continuity mistake: When Bugs bends Toro's horns on the bull shield, the horns change position 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.