Near the end of the film you can see the electrical wires running (presumably buried for most of their length under the differently-coloured soil) to a man's body as he is 'shot'; the last yard or so of wire -which is presumably for the gunshot SFX- is clearly visible running towards the man's ankles.
When the town council members meet the County Sheriff from the train they walk through the livery stable. As they do so in the top left corner blue/white smoke is rising very similar to that from film arc lights.