Continuity mistake: The shape and width of the scar on Stuntman Mike's face slightly varies between the scenes (from thin in the shot where he is pouring some eye drops into his eyes, to almost invisible during the scene at the parking lot in front of the shop in Lebanon, Tennessee, and wide during the final rush).
Suggested correction: This is untrue. The movie is out of sequence, like the reels were put together wrong in an old Grindhouse Theater. The car also changes when his scar is different if you pay attention. This whole movie also takes place in the wrong order of the double feature according to the storyline. This was NOT a mistake but done on purpose and slides to this in the making of book.
Revealing mistake: The '70 Challenger doesn't have a framed door - thus no place to anchor the belts.
Suggested correction: They're anchored to the floor.