Here's my stream of consciousness thoughts on claims:
RR: Claim seems pretty solid. I can imagine ways that scum could fake a claim like this, but it is somewhat nontrivial or slightly bastardy. Usage is plausible (I would have used it N0 to leave a crumb, and wouldn't have targeted FF, but I can see why RR might have) and confirmable. Having a doctor whose targets can confirm him feels pretty powerful to me especially when many of the townie powers are actually weaker variants of standard roles, and having both mpolo's power and RR's power on townside is potentially extremely strong. If RR is town, scum does not have complete knowledge of the setup. Contradiction with BoomFrog's claim, though the problem appears to be on Boom's side as RR's action is verified.
BoomFrog: Watcher is a tricky claim to fake. I have a hard time believing that scum!Boom would attempt this so early in the claim order, and that he would deliberately create a contradiction between his own claim and RR's if this were a fake claim. If both are scum, I suppose this could be a planned bus. Possible that Boom was roleblocked. Need to think about the scenarios here a bit more.
FrozenFlame: Claim is essentially impossible to verify. I would think that having a power like this would be an excuse for FF to play more aggressively and try to draw the NK. Doesn't really improve my opinion of FF.
Madge: I don't really want to activate her as her powers are quite dangerous in the hands of scum. Sabrar claims he jailed her, but Madge apparently never received the message. Some odd inconsistencies in her claims about whether or not her role says Tree Stump. On balance, I'd be tempted to guess this is more likely to be a scum power as Town!Znirk already had a similar power that didn't have such an arduous activation requirement.
plytho: I can confirm his claims, so no surprises here. As I noted on D3, I find his usage of this power to be, on balance, fairly scummy. I personally would definitely have been trying to get votes to activate this power right from the start of the game, and his initial reluctance to do so is really weird, and I am skeptical of his reasoning around it. I would normally associate this power with Town, but the way plytho has played it struck me as off.
mpolo: Not much to say here since he claimed already and has to all appearances been using his power in a very townie way.
Sabrar: Claim looks fine. Odd inconsistency in that Madge did not receive notification that she was jailed by Sabrar on N2.
EGW: Noting that EGW has a roleblock that he claims he hasn't used.
bessie: Poor bessie