When Riggs throws the bottle of water to Getz he catches it with his left hand, then immediately it is shown in his right hand.
When Martin Riggs and Karen Palmer jump from the helicopter, Palmer's hands go from being tied up to being free to tied up again as they are falling.
When Leo and Roger are in the motel flipping the light on and off the switches next to Roger never change position.
There is blood on Riggs pants before he gets into the elevator to examine the dead guy.
Murtaugh keeps flipping light switches which never change position.