Revealing mistake: Just after Mr. Creosote explodes and all of the guests are vomiting, there is one male guest third from the front that is puking. Though his hand is up near his mouth, it is clear that the puke actually comes from his hand rather than his mouth, revealing that he is holding something that produces the fake vomit.
Continuity mistake: At the end when everyone is in the dining room in heaven, Mr and Mrs Brown (The Liver Donaters)are sitting at a table in the foreground. The dinner guests walk down the steps and the camera angle changes. You can see that a different man is sitting opposite Mrs Brown where Mr Brown should be.
Audio problem: In the "Every Sperm is Sacred" song, when the priest and the newlyweds sing, the woman's mouth stops, but her voice is still heard.
Continuity mistake: During the "Crimson Permanent Assurance" short film at the start, watch when the old men are climbing out of the windows on to the scaffolding. One of the men drops his sword as he goes out the window, but when the scene switches to the outside view of the same man climbing out, he is holding it in his hand.
Visible crew/equipment: During the "Find the Fish" scene, during one close up, a camera is very visible in the top right corner of the screen.
Visible crew/equipment: In the scene where the insane sergeant lets all his squad off to see a film at the cinema etc, the microphones are visible under their tight tops. Look at the middle of the chest of anyone who is talking, and there's a lump there, yet it is not there on any of the none-talking soldiers (so it can't be part of the uniform).Gary O'Reilly
Continuity mistake: During the scene at the end where the Grim Reaper comes to take away the dinner guests, Eric Idle leads the reaper into the room. Graham Chapman is walking behind Michael Palin sitting down. When the camera cuts to Michael, Graham is nowhere to be seen. Then when the camera cuts back, he is standing there again.