Other mistake: Chambers asks what time it is on Earth, a strangely vague question to which the Kanamits grant an equally odd answer: on Earth, it is noon. It can't be noon everywhere on Earth at once. While it can be fancifully explained away ("They somehow knew to answer for the time zone he was taken from"), it still jars the viewer, because neither Chambers nor the aliens, both highly intelligent, should make this sort of imprecise mistake. Both director Richard Bare and Damon Knight, author of the original short story, confirmed this as a scriptwriting error that should have been caught before shooting began.
Other mistake: When Lillian calls Oliver, she tells him that the car stalled at 3rd and Park - the original scene of the accident. Later, when Oliver goes into his garage in the middle of the night, the car turns on its radio and goes to a news broadcast about the hit-and-run that took place at 3rd and Elm.
Other mistake: As part of the story line, three men see different tail numbers on the plane. However, the first and third sets of numbers are printed on a big sticker, because the numbers are a different style than the second set. Also, they used two different planes. The second tail number is N67588, which should be on the bottom of the wing, but that number is N107932.
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Other mistake: When Mike first walks into the town he sees the ringing church bell then looks to his right. The camera acting as his POV pans from left to right but since he was already looking to his right then the camera would be facing the direction he just came from.