Character mistake: At the end, Shane calls Joey "Jimmy" twice, then he calls him Joey correctly.
Character mistake: During the first big battle between the Martians & the U.S. Army, the Martians use their heat ray to vaporise people and equipment. Dr. Forrester, a physicist, then quickly speculates, "It neutralises mesons somehow. They're the atomic glue holding matter together. Cut across their magnetic lines of force and any object will simply cease to exist." During the '50s mesons were theorised to hold atomic nuclei together strongly. But if the Martian rays worked as the Dr. guessed, then objects wouldn't just vaporise. They'd explode with the ferocity of nuclear weapons.
Character mistake: The card that Speedy leaves for George to read says "Speedy Gonzalez" instead of the traditional "Speedy Gonzales."
Character mistake: On the sign outside Dr I.Q. Hi's headquarters, the word "Stratosphere" is spelled "Stratopere."
Character mistake: When Tom opens the "Life with Tom" book to Page VII, we see the page and there is a typing error in the very first line. The word wasn't is misspelled as "was'nt."
Character mistake: The hand bill identifies the company as Slipp-Skipp and Tripp. The sign on the door says Slipp, Tripp and Skipp.