1. I found the truth system okay enough to understand, but that's because past experience with murdergames made it so I pretty much liken it to bolding theories in trials. I'd definitely give some clear examples for murdergame newbies, especially highlighting not only how careful one must be about reading red truths, but also how careful one must be about writing blue truths.

2. Definitely powers off. Proving a witch with magical powers did not commit a murder that was still done with magical powers could be extremely difficult depending on what powers go through, especially since I presume most smart characters would be hiding their skillsets to make it more difficult to lead back to them.

3. I have a wide availability but that's just me. I think you should probably confirm what time works best for the actual round's players!

4. I would also make sure that the players are aware that all investigations for new clues must be completed during the investigation and that you cannot check for more things during the trial itself. Each game does it a bit differently, so making sure that everyone's on the same page is important imo since both cases this slipped our minds as players, whoops.

I had a lot of fun even with how short mock round was, and I'm looking forward to spectating when the real thing occurs :3c