1: Is your undergrad major a big part of law school applications? ( meaning do they favor certain majors)

Nope. Major in whatever you want and do well at it.

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2: In real court, is it more fun to argue civil or criminal cases? I, in mock trial, love civil cases more bc they give both sides a story to tell (burden of proof is neutral).

I've only ever done criminal, and have never touched civil. I do know that in a real courthouse, probably 95% of the trials that actually go are criminal trials. Civil cases almost never go to trial because they settle, sometimes in the eleventh hour. Criminal cases settle at the last minute too, but there's so much more volume of criminal cases than civil. In the real world, what's going on in a civil case is that insurance companies are worried about their bottom line; so they're motivated to settle for a sum than gamble at a trial where a jury could award the plaintiff a lot more.

they were under 18 at the time and almost got put on the jury. If they were put on as a minor, is that grounds for mistrial?

If they were under 18 on the day of the trial, it would only be a mistrial if they were sent back to the jury room to deliberate for any amount of time. If it was found out before then that they're a minor, the remedy would be to just strike them as a juror and bring in an alternate.

Declaring a mistrial is supposed to be the last resort. If there's another remedy that can solve the issue without declaring a mistrial, then a mistrial is inappropriate.