Revealing mistake: When Uncle Vernon picks up the letters for Harry and tears them up, you can see cuts in the envelopes, in order to make it easier for him to tear all of them at once.
Picture submitted by nightline
Continuity mistake: After Gerry gets smacked in the face by the 'broken' suspender clasp, we see the silver clasp land under the dresser. Yet, when he's moaning and lifting his leg to get onto the bed, we can actually see the clasp still intact on the front suspender that came loose, which is dangling right behind him (just look between his legs). Of course, in the next shot, that clasp is gone. Since the silver clasp is one of the plot points, this is bizarre to say the least.
Continuity mistake: When John and Catherine are in the hangar at the runway, the Cessna's tail number is N3035C. When the plane is shown in the air, the number is N3973F. When they land, the tail number has changed back to N3035C.
Continuity mistake: In the bedroom scene the girl is holding a clear cup full of beer. The camera goes off her and when it comes back she is holding a blue cup. The camera goes back off her then on her and the cup is clear again.
Continuity mistake: When Sam is in his bedroom, after he finds the Cube sliver it falls and dramatically burns a hole through the floor into the kitchen. But Sam's bedroom is over the living room (there is nothing on the ground floor below Sam's elevated bathroom, and in the first movie Jazz hides in this open space), and the kitchen is actually located between the den and dining room, at the other end of the house. If they were to follow the actual floor plan of the house, the Cube sliver would have landed in the area of the piano in the living room, but where would the fun have been in that?
Continuity mistake: When Julia is entering her office building she is wearing a black skirt and pantyhose. When she is inside opening the office door for her sex addiction group she is wearing black leather pants under the skirt. Then a few shots later she has pantyhose on again.
Continuity mistake: In the scene where Katniss has just come outside after the bombing on District 13 and there are white roses everywhere, she picks one up and it is closed and small, but then in the next shot the rose is very long and is opened.