Continuity mistake: When one of the new recruits is sitting on his bed and looking at a photo of "Jeannie-Weannie", we see a close-up of the photo and behind it is the recruit's holdall. Later on, when the bald-headed recruit is sitting on his bed looking at the same photo, we cut to a close-up of the photo and it is the same shot as seen earlier.
Continuity mistake: In a close-up of a photo of "Jeannie-Weannie" being held by the one of the new recruits, his left hand is holding the photo at the bottom, but when we cut to the recruit in the next shot, his left hand is now holding the photo in the middle.
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.