Best comedy movie mistakes of 1931
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Continuity mistake: When Stan and Oliver approach a group of singing prisoners in the prison yard, Stan's outer shirt is buttoned, but Oliver's is not. In the next shot, we see a close-up of Stan and Oliver and Oliver's shirt now has a button fastened.
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.