When the girl in the bar tries to buy matches, she holds up an unfolded bill. The camera angle changes to a close up of her and now the bill is crumpled in her hand.
Just before Renard is run over by the 1959 DeSoto, there is a 1959 Ford in the background. The location of the Ford changes from one shot to the next.
When Renard is sitting on the curb putting his new shoes on, the curb is wet. When he then gets up, the seat of his pants is wet; however, after he is hit by the vehicle, and lands face down, the seat of his pants is dry.
Right after the old man Pedott first comes into the bar, the camera changes to a shot of Renard sitting at the bar. For several seconds, the frames are running backward (you can see smoke coming down to the cigarette instead of rising up from it).
When Pedott drops his case and the spools of thread roll into the corner, Renard picks up a spool from where one had not rolled.
Pedott is shown in the opening scene going from person to person selling odds-and-ends in a bar. He approaches Lefty, who does not know him, whereupon the bartender tells Lefty that "the old coot is in here every night". The bartender later says that Lefty is in the bar "seven nights a week." Since both men are in the bar every night and Pedott tries to sell to everyone, Lefty should have already have been familiar with Pedott.
Since Renard's scarf was not knotted around his neck, all he had to do was turn his body to twist it off. There was no need to use the scissors.