As for AJ, I did find his "debut" from MacGyver from like 1989. It's not much, but kinda interesting. If you start at around 35:00, he plays the kid "Julio" and is shown playing the piano. http://www.cbs.com/shows/macgyve
Ah, here it is:
Your first television appearance was in an episode of MacGyver, is that right?
Uhh yeah....that was my "stunning debut"!
So how did you get that role, and were you nervous about breaking into television?
Was I nervous? I probably was, I don't honestly remember... I'm sure I was almost paralyzed with fear, now that I think about it! I was probably almost eleven or something. It was the coolest thing ever. I got to miss a week of school, I got to hang out on the sets, I was playing some piano-playing street kid... It was probably the most boring episode of MacGyver in history unfortunately! There was nothing really that cool about it. It was like the MacGyverChristmas special for that year. So Richard Dean Anderson didn't get to do anything fun with Duct Tape. I think his big moment of ingenuity was moving a boxing ring across a room with a bunch of dumbbells. But it was still kind of fun and exciting to be a kid in that environment -- totally foreign, totally new to me. What do I carry from that now? I got to meet Richard Dean Anderson, who I also met again later as well, because I worked on Stargate a couple of times. Surprisingly, he didn't remember me! (laughs) But I still have the T-shirt that he gave me himself at the end of that week. It's a really good T-shirt to paint in, so it's seen a lot of wear and tear.Anyway, enjoy!