What are some general clues that indicate if someone is playing the role of saboteur? Obviously if player is going to put a troublesome dead end on the only path he's a saboteur. But some players are more subtle, and they come out of cover late in the game. How can I spot a saboteur early on in the game?
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Another way not mentioned by @Bazzz is to keep an eye out for when people make rockfall spots. As a Saboteur, it's useful to place paths in a way which you can claim to be good for the diggers, but with the real reason being that with a correctly timed and placed rockfall, the gap is harder to fill. Call out people who create these spots and encourage actual diggers not to do this.
This is something new players often have trouble grasping.
This flowchart is how a computer AI would decide(from here), but is pretty useless to humans. I'm just putting it here because I thought it was kind of cool:
And if you still don't know, just call them a "saboteur" and see what the general reaction is. :-)