Factual error: At the beginning of the film you see the car coming around a bend and see a double yellow line in the center of the road. White center lines were used as early as 1917 but weren't widely used until the early 50s and center yellow wasn't mandated until 1971.
Factual error: When Jack turns on the radio in the V8 roadster, I don't think they had instant-on. I'm quite sure it had vacuum tubes.