Continuity: In the second-to-last scene there is a large wet spot on Jennifer's blouse. A few seconds later, the wet spot is completely gone.
Continuity: After he draws the Harry's feet, Sam puts the paper block under his left arm with a white sheet on the outside. In the next shot the sheet on the outside has many drawings in it.
Revealing mistakes: After Arnie discovers Harry's body in the bath tub, Harry's foot can be seen twitching just as the door opens for the second time.
Audio/visual unsynchronized: Throughout the whole movie the audio\video is mismatched due to the fact that parts of it were filmed in a local gym due to bad weather.
Boom mic visible: When Sam and Jennifer are talking in Jennifer's house, the shadow of the boom mic can be seen moving across the top of the doorway behind Sam.
Continuity: Sam's pants have a lot of paint/charcoal on them when he's in the store but are relatively clean after he sketches Harry and speaks with the Captain.
Audio/visual unsynchronized: After Arnie opens the door to find Harry in the bathtub he asks, "Hey, what's he doing in our bathtub?" Once the camera switches to a wide shot you can see but not hear Arnie repeating the end of the line.
Continuity: When the Captain and Miss Gravely are at Miss Rogers' home, the Captain is holding his shovel with the blade down. In a close-up, the blade is up by his face. Then later, it is down again.