Continuity mistake: When Stewie is building with blocks, you first see a pyramid with three blocks on the bottom and two on the top. The shot changes, and he puts two more on the top, near the edge. When the shot changes again, suddenly there are five blocks on the bottom, six on the second layer, and two on the top near the middle. The letters and pictures are also all different. (00:09:50)Kathy Tjarks
Continuity mistake: When Peter catches up to Brian in the golf cart at the rehab facility, Brian is seen wearing a track suit with a headband and holding hand weights. Peter convinces him to go mess with the pregnant teens across the lake and in the row boat over Brian is still wearing the tracksuit and headband. However, when we see them enter a room where the pregnant teens are he has obviously taken off the tracksuit and headband and is just seen wearing his dog collar.Tobin OReilly
Factual error: When Brian fires his pistol in the air, eventually killing the Super Devil, we hear six gunshots, each followed the distinct clink of the ejected cartridge hitting the ground. Trouble is, Brian is firing a revolver, which does not eject the cartridge after the bullet is fired. Only automatics do that.