Revealing mistake: When Two-bit Mathews returns from the hospital gift shop with a copy of "Gone With The Wind", he hands the book to the nurse asking her to make sure that Johnny gets it. The book he hands her is an obviously used paperback with the upper front top right corner and pages all bent back. Shouldn't a gift shop sell NEW items? The book is only shown from the non-title side so they could have used any paperback for the prop as long as it looked like it wasn't several decades old.
Revealing mistake: During the riot at Freedomtown, the camera pans over to Rebenga exiting the telephone booth. As soon as he leaves the phone falls down inside the booth, but there are no wires attached to the back of the phone. (00:11:25)
Revealing mistake: Right after a fleeing felon is shot dead and falls into the pool (whereupon Murphy says "He's bought it"), he appears to be swimming to stay afloat. (00:12:10)
Revealing mistake: As Harry approaches the Acorn Cafe (which he is about to shoot up), you can see that the two window panes just right of the door are candy glass. This is confirmed when one of the 'heavies' goes flying through them after Harry gives him the .44 Magnum treatment.
Revealing mistake: Solo's stunt double is easy to spot in the scene where he rappels down the cliff and jumps into the truck bed. The double has quite a bit more hair. (01:12:30)
Revealing mistake: Obvious dummy when Mick slams into Paco's little brother. (00:21:05)
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)