I'm not sure I'd rent anything from that guy again. "Just add oil"? WTF? The clicking could have been a number of things, judging by the rental guy's mechanical aptitude. Since he told you to ride it back, I'd have done it. I'd never do it on my bike, though.
What exactly are you checking for by revving for 20 seconds? If it's low enough on oil that you'd actually hear something, you're probably damaging the engine by doing that.
You have some strange mechanical ideas, I'll say that much.
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