Continuity mistake: When Books falls in the bathtub, Mrs. Rodgers goes in to help him, and about three seconds later, he emerges from the bathroom fully clothed in his robe and a towel around his neck.
Revealing mistake: In the closing scene, you can see the modern curb & sidewalk have been covered with dirt.
Continuity mistake: In the scene where Books and Gillam share a bottle of whiskey, as the camera changes angles the bottle label is always away from the camera.
Continuity mistake: In the bar room fight, Books fires three times, then once with revolver in his right hand. Gilliam picks up that same gun and fires three more times - a total of seven rounds from a six-shooter.
Continuity mistake: When Books is in the barber shop talking to Mr. Beckham the undertaker, in different scenes Books' tie is either inside or outside his vest.