Factual error: Teddy wears army boots that did not exist in 1959.
Factual error: When the two drivers of the teenage gang are playing "Chicken" on a straight section of a two-lane highway, the center lines of the road consist of yellow hashmarks. Though the picture was set in 1959, center lines for passing zones on two-lane highways were painted white until 1971.
Factual error: There are aluminium cans in the general store. The first all-aluminium cans of this style weren't used in 1959, when the film is set. (00:24:05)
Factual error: Near the end of the movie, when the boys return to town, a garage door in the background is a modern metal roll-up type that was not available in 1959.

Factual error: After Wil Wheaton fires a warning shot, he points the pistol at Kiefer Sutherland and pulls the hammer back to threaten him. However, this is a semi-automatic pistol, and the hammer would already be cocked after the shot he fired. (01:13:40)
Factual error: When Gordy goes to get supplies at the store, as he is standing there the clerk is talking about Denny, and in the background on the shelf there is a bottle of Soft Scrub. It's supposed to be the 1960s, but Soft Scrub was not around until the early 80s. (00:25:00)
Factual error: When they find the dead body, the body looks like it has been dead for only a short while, his face even had a pinkish color to it still. Factually, the body would be a lot more decomposed after a few days, bluish or white in color from the blood pooling at the bottom of the body, since the body was on its back. (01:08:30)
Factual error: When the boys first start their hike at the railroad yard there is a modern transformer on a pole in the background. In 1959 they were smaller and black. (00:15:00)
Chosen answer: Its a game called three-penny-scat. I'm not 100% on the rules, but I think you get three cards, take the value of them (Royalty =10) and whoever gets closest to thirty wins. According to the book, it's one of the most boring games invented but "it was too hot to think about anything more complicated".
SexyIrishLeprechaun