Continuity mistake: When Jack sails toward Port Royal, he passes the skeletal remains of hanged pirates, to whom he pays a respectful bow. First, there are two wideshots of the skeletons, then in the close-up they are actually wearing more clothing, particularly the strapping middle guy, whose head position differs, and his straw hat is larger as well.
Picture submitted by Super Grover
Continuity mistake: After chasing down Sully, the yellow Porsche is totally wrecked on the left side, until Arnie drives it away, and it's fine.
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?
Revealing mistake: When Cap is driving the blue Chevrolet Silverado with Black Widow, the gear shift is in the up locked position, not lower on the column, indicating the truck was towed in the scene.
Continuity mistake: Spoiler: At the end, Gally has shot a lead character. Gally shoots Chuck, and Minho throws a spear through Gally's chest, killing him, yet a minute later when Thomas looks back at Gally, the spear is nowhere in sight.
New this month Continuity mistake: When the young girl is on the beach removing her socks, she takes three socks off.
Plot hole: Once the countdown to release the poison has been stopped, The Shredder cuts the supports of the tower holding the poison container so that it will fall and release the poison by smashing open. The turtles attempt to support the tower, but in order to save April they fail and the tower falls anyway. Then the movie forgets that the poison exists. The act of the tower falling gets rolled into another action sequence and after it completely smashes to the ground, no poison. The turtles don't even mention it.