In front of the Hotsey Totsey Club, Diamond's would-be assassin fires three shots from a double-barrel shotgun without having had time to reload.
Legs Diamond is seen being killed outside but in fact Diamond went to the rooming house where he was staying and passed out on his bed. Two gunmen entered his room around an hour later. One man held down Diamond while the other shot him three times in the back of the head. by unknown gunmen.
The Beech Twin supposedly used to transport the Untouchables to Buffalo wasn't even on the drawing board in 1931, the year in which this episode is set.