Factual error: When Glen and Nancy are talking on the bridge, you can see huge palm trees in the background. Though this was filmed in California (hence visible palm trees at the cemetery), the fictional Springwood is supposed to be in Ohio - they show the location of Springwood on a map at the start of 'Freddy's Dead, the Final Nightmare', and there's no other conflicting in-universe location given within the series. So it's established as Ohio, but there are no palm trees in Ohio. Other California "hints" add to the mistake, such as CA license plates, etc. (00:01:00 - 00:43:22)
Factual error: When Tommy is playing Zaxxon on his computer, he is about to go into a barrier and die. Firstly the audio of the ship crashing happens before it hits, secondly, in the next shot the ship has reappeared. (00:14:30)
Factual error: For a movie supposedly set in late December in a Northern state, all of the deciduous trees still have leaves on them. The most obvious place to see this is in the opening scene, when Billy is trying to start his car in front of his house. (00:07:05)
Factual error: In the scene with Tempest (the video game in the cinema's foyer), Regina is annoyed to find the tag 'DMK' shown in the scoreboard, which she otherwise dominates, and she sets out to remove it. After completing a game which scores higher than 'DMK', she overwrites his name on the scoreboard and her name is both above and below. If this had been a real video game, his score wouldn't have been removed from the list, it would have just dropped down one place. She would have needed to play several games, bettering the 'DMK' score every time in order to own the board again. She would just keep knocking DMK down the list, she could only overwrite the last place.
Factual error: When Andy and Charlie have caught a cab (allegedly in Manhattan), and the agents are running after the car, we see green letters reading "Manor", which is a movie theater in Wilmington, NC. (00:03:19 - 03:26:00)