I was just about to post this. As far as Richard Simmons' fighting, I don't think anyone would be suprised to read that he chooses to slap. My guess is that he couldn't get close enough to bite or scratch.
I loved the episode. The best part was when the lead detective was trying to get Monk to stop snooping around. "Aw, geez. The barricades don't line up properly." "You're just trying to get rid of me." "No, I'm not. Look.