Continuity mistake: When Butch and Phillip reach the end of the tarred road they stop directly in front of a signpost. Towards the end of the scene there are some shots where the distance to the post is at least five meters, and also from the position of the steering wheel one can tell that the car has been moved in between.
Plot hole: There's a number of strange things about Butch's and Terry's escape: When the grid falls down the very loud noise passes unnoticed. After they climb down the tied bedsheets Butch pulls once and it comes down, although no-one tied it loose. And finally, their escape route ended within the prison walls, and they needed to kidnap the clerk, who had come back into the prison to get some papers, for the escape in his car, something which wasn't planable at all.