The Hand (1981)

Visible crew/equipment: When Michael Caine leaves the Last Chance Saloon at night and is walking along a sidewalk in town, he looks inside one of the store windows to see something moving under an old cloth. As he looks closer to the window, suddenly a hand jumps out from under the cloth and crashes through the store front window from the inside and grabs Michael Caine's throat. What is so laughable is that the crew or extra who is putting his hand through the breakable glass to get at Michael Caine's throat fails to "hide" his entire arm from view and what is supposed to be a severed hand is not only the hand but the entire arm attached.