Factual error: The scene at the car lot in the beginning is supposed to take place in Chicago. Mountains and palm trees are visible in one angle when Clark is talking to Ed about the car being the wrong one.
Revealing mistake: There's a short ramp by a truck's cargo bed, but when the bikers ride over it, it's become a longer ramp that goes up to the cabin to allow for the stunt. (00:06:14)
Visible crew/equipment: When Ponyboy, Dally, and Johnny are pulling up to the burning church, just before the first one jumps out of the car, if you look through the windshield, you can see the water truck that's going to put out the fire after they shoot the scene.