1: Yes, it doesn't matter. The chancellor will lie to the jailor about your sentence. THat is because if you were recognized innocent and let go, Marle/Nadia wouldn't run away with you, and you wouldn't enter the gate, and you wouldn't find out about Lavos. You only say it's retarded because you're used to the more recent RPGs giving you rewards for EVERYTHING YOU DO, which is just so realistic. "Thanks for mowing my lawn, here's a Sword of Blunt!"
2: I got all the jurors on the correct side on numerous occasions. The trick is to be a model citizen and speak naught but the truth in the trial.
3: No one badmouths Chrono Trigger in any way, except for that thing were you see a sealed item in the present, go in the past to power it up, agrab the upgrade in the present, then go grab the original in the past. Therefore, you have two different versions of the same thing. That's stupid(but fun)