I loved 99% of this ep; even the beer scenes didn't bother me, as they were played for comic relief and I can understand why Jack, after such a traumatic experience, would want a cold brewski.
I loved MiniJack; the young actor was perfect, and I'd like to see more of him. I loved the Daniel-Teal'c exchange: "Name one" "Well, the time he got really old, the time he turned into a caveman, the time we all swapped bodies".
However, I have to agree with the posters who didn't like the last scene. I agree that MiniJack wouldn't last too long in high school, subject to the restrictions of a schoolboy.
I also didn't like the implication that now he was going to date 14-15 year old girls. He may look 15 but he's not, and the thought of MiniJack chasing after girls who are both completely inexperienced and too young to get birth control on their own creeped me out a bit. It would be different if he were 19-20 and going off to college again, meeting women old enough to vote.
Anyway, aside from that it was a very enjoyable episode, with all the team members getting to play a part.