Continuity mistake: In the end, when Steve McKenna is filling the car with gasoline, after he says it is Arthur's last chance for buying something in the shop, the gas hose is out of the car, and Steve is opening the cap, whilst he already started fuelling the car. Next shot, he takes the hose out, and displaces it.
Continuity mistake: The pearl handled gun that Harry Mckenna pulls out of the garage has stamped on the right side, Auto-Ordnance Corp, West Marley NY and a serial number of TGM10263. At the end of the movie, when Steve Mckenna dies and the gun is on the ground, it is a different gun. Now on the right side it has stamped, United Stated Property M1911 US Army and a serial number of 949186. (00:20:55 - 01:25:35)vsp1945