The gun Peter Hitler pulls out of the desk was put right near a lamp. But when he picked it up again the lamp was gone.
After the burglars capture Meg, they show a sign to the camera that says "we have your son", when Lois tells them shes their daughter, the put "really?" on the back side, but when they show it to the camera, it is on the front side.
Peter hands out three parachutes, but in the next shot there are four, given to Brian, Lois, Chris and Stewie.
After Meg jumps one of the thieves and he runs behind his friend, both thieves' gloves disappear.