At the dinner table while Clarence is talking to Alvin, Clarence has a fork in his hand, then in the next shot he isn't holding anything.
At the beach when Alvin comes out of the cave, first his shirt is over his head and one arm is threw an arm hole. When the camera goes back to him you see the white tank is only over his head.
When Walter walks into the locker and falls down, you can see the mat on the floor.
When Paris tells Al, "I wrote those words" she's really saying something else.