Wasn't the "Mike" actor (Kevin Tate) also the boy at the very end of Wild In The Streets ("We're gonna put everyone over ten out of business.") ? He's listed as Billy Mumy, which it certainly isn't, but he looks like the Mike actor, slightly older.
Perhaps because I was so young, Mike never hit me at the end, but the opening theme starting up and Eden, O'Connell and co. running after Mike and the red circle always stunned me. Maybe had I been older, Mike himself would have hit me, but I havent seen the full movie in a very long time either.
The child actor was cute, granted, but he made the character (or the director did) a little on the cry-baby side. I felt the young man overdid it just a bit. Heck, he almost started crying when he received a balloon from Dr. Lao!