Betty runs back to the hotel in the dark, then immediately heads down the fire escape with Charles. But when they get down to street level it is broad daylight.
The red truck at the beginning of the movie that has the teenage couple in it keeps changing. The wooden side rails on the truck box disappear and reappear.
The aliens in the town destroy anything that comes to town that was created after they arrived in 1958 yet one of the cars that Charlie attempts to steal to escape the aliens is a 1959 Pontiac.
The town that Charlie's ex-wife grew up in is located in the United States obviously, but several cars in the town, the two Meteors, the Monarch, and the '59 Pontiac Parisienne, were only sold in Canada. This is because the movie was filmed in Canada but is set in the US.