Corrected entry: This film supposedly takes place at noon, but the shadows vary greatly in direction and size.
Corrected entry: In the opening, as the three gunmen cross the tracks toward the train station, a helicopter can be seen flying overhead. It stops and turns sideways in the last couple of frames.
Correction: It's not a helicopter, it's a bird.
Corrected entry: Just after Kane's wife and ex-mistress drive past him, there is a crane shot that pulls up and away to show the lawman alone in the streets. As the frame clears the tops of the set, the audience can glimpse the high-rise buildings of Los Angeles in the background.
Correction: After watching this scene, all I saw were tall trees in the background, not the skyline of Los Angeles.
What about the modern electric poles in that shot?
Correction: The film takes place one morning, over a time span of just under two hours - from 10.35am to 12.20pm the same day. Obviously the whole film does not take place at noon, only the climactic gun battle does - and it was shot at noon, over four consecutive days. The shadows are just what you would expect throughout the film.