When the bad guys go on a car chase to get "Candid" (Jack Carson) the scene starts out in the dark, then instantly goes to broad daylight.
At the 0:22:59 mark when Nancy reads a note from Bill the close-up of the hand holding the note has on dark nail polish, but Vickie Lester appears to be wearing no polish.
Early in the picture, when the mayor's car pulls away from in front of the courthouse, crew members and studio equipment, including several stands and a step ladder are visible in reflection in the car's two rear passenger side windows.