Visible crew/equipment: In the scene were the adults go back into the sewer, and they have the feeling: "Something is coming", you can see the shadow of the cameraman, twice. One time, coming closer from a pipe, and another time, moving away. Look on the right wall/right on the floor.
Character mistake: A newspaper is shown saying "Girls Body Found" as plural when it should be "Girl's Body Found" as a possessive.
Continuity mistake: Using the slingshot, when Bev is about to shoot the cans and bottles, there are 2 white bottles, 2 black bottles, and 3 brown cans. After she shoots the bottles, somehow a third white bottle appears to be shot after the first two were already gone.
Factual error: The kids are leaving a movie theater that's playing I Was a Teenage Werewolf. This film was released in June of 1957. So one, they are in 1960 and this film would not still be playing. And two, they were shown still attending school, but they would not be attending school in June during summer break.
Suggested correction: Before the rise of home video, movies had much longer theatrical lives. It was not uncommon for a film like this to be shown as a Saturday matinee years after its initial release. I personally remember a local theater showing movies from the 60s well into the 70s.
Continuity mistake: Richie is wearing a green brown and white striped shirt when we first see him in the school. But moments later he's wearing a solid mint green shirt.
