Factual error: After Harry Powell disappears from in front of Ms. Cooper's yard, a barn owl swoops down on a rabbit. We can hear the owl's wings flap even though barn owls make no noise when they fly.
Factual error: The opening scene shows Spencer Tracy on a crack streamliner in the desert east of Los Angeles, featuring red and orange coaches. Such equipment was used by the railroad on only two trains, neither of which crossed the desert east of Los Angeles, and both of which had matching red and orange locomotives. In the film the train is pulled by a dark gray locomotive normally used only to haul freight, and in a close-up shot the number in the locomotive is preceded by an X, which in the language of railroading refers to an extra train.
Factual error: The Boccherini string quintet is actually scored for 2 violins, 1 viola and 2 cellos, not the crooks' line-up of 2 violins, 2 violas and 1 cello.
Suggested correction: I don't really know anything about how string quintets (or quartets) perform, or how any group of musicians might prepare to perform a well-known piece composed many years ago. So maybe my answer is not valid. But would it be acceptable within the music community for a musical group to re-score a piece, so long as they remain faithful to the original? If two members of a string quintet said they were more confident and capable on a viola than on a cello, would the quintet re-score the piece accordingly? Is it acceptable for musicians to adjust a long-established piece of music? Another possibility. The crooks are not musicians at all. They pretend to be musicians, but this is only a "front" for a bank robbery they are planning. They maintain the pretence by miming to records. So is this a subtle joke?"Look, the crooks are pretending to be musicians, but they are getting it all wrong! They are playing the wrong combination of instruments. Ha ha!"
I asked a friend who belongs to a string quartet if you could re-score a quintet piece. She said this would be complicated, difficult, and more trouble than it was worth. So I must retract my suggestion that the crooks re-scored the Boccherini String Quintet. But maybe I am right with my other suggestion. The crooks are not musicians, but only mime to records. Thus, they use the wrong combination of instruments. This is therefore intended as a subtle joke.