Francis destroys the keyboard. Initially he has a tool in his right hand Then it disappears.
Opening scene. Hal Declares "Zero tolerance." The napkins in the rack vary from upright to disarray depending on camera angle.
Willie plays an electronic keyboard. When Francis thumps it with a tool, it sounds like a mechanical piano. As though there were physical wire strings.
When Francis is trying to uncork a bottle he repeatedly turns the corkscrew through 90° and back again, before pulling the cork out. Of course this wouldn't work in reality.