Corrected entry: When Han is firing the Gatling gun at Frank and Marvin, he asks Frank "Where's my plane?" and Frank answers "In my ass!" Frank is lying on his left side, head towards the curb - the camera angle is "left" down the sidewalk. He leans up on his left arm to move positions, the camera angle changes to Frank's other side - but Frank is now lying on his right side, flat to the ground.
Corrected entry: When Sarah shoots with Marvin's Mag 44, you can tell it is loaded with blanks, since that gun should have a very powerful recoil, but she holds it completely steady.
Correction: It's mentioned in dialog that it is a Sig, not a Mag. Sigs generally have a smaller round and therefore a lower recoil.
Correction: The first shot you refer to is of Bruce Willis, the second is of John Malcovich.