Revealing mistake: There is a large painted hanging cloth backdrop of clouds in the mountain scenes near the end of the film. Vertical streaks can be seen in the backdrop that are the pleats in the fabric. These streaks really stand out in the restored versions of the film.
Continuity mistake: When Stan pulls the door into Oliver's face, Oliver falls backwards and the spring on his back sends him skywards and onto the piano. When Oliver falls onto the piano, you can see that there is nothing on his stomach, but a few seconds later he is covered with piano hammers and other parts from the interior of a real piano.
Continuity mistake: The second-story room of the prison warden's daughter is on fire and she is screaming for help. Stan has trouble connecting a fire hose to a water valve and Ollie winds up completely drenched, but in all the following scenes where Ollie is using a ladder to try to rescue the woman, his clothes are dry.
Continuity mistake: Near the end, when Tom Powers is waiting in the rain to murder Schemer Burns, we see Tom wearing a tall, straight-crowned fedora that is only slightly tilted to his right. Suddenly, and for no apparent reason, we see a close-up of Tom wearing a completely different, taper-crowned fedora that is tilted deeply to his left. This close-up lasts for 7 seconds, then the shot returns to Tom wearing his original tall, straight fedora.Charles Austin Miller