Revealing mistake: When the brown Vanden-plas hits the skip you can see that the cars engine has been removed also the moment of impact is shown twice.
Revealing mistake: At the end after the driver of the wagon has fallen off and the horses are running wild you can see a slot in the front of the seat and arms holding the reins.
Revealing mistake: After Scott and Tom switch places, during the drive down to the hotel, in some close-ups there's black tape covering the motorcycle's chrome trim. (00:06:35 - 00:07:10)