Character mistake: As the little boys are trying to get a peek at Donna's breasts, you see more and more of them. The first two times, you can't see them. The final time, you can see a kid or two far left. They're having trouble standing still. When it cuts to a wider shot, the kids come from behind the wall to see Donna. Chances are, since the aspect ratio was intended for 4:3 TVs, they didn't intend for the kids to be visible.

That '70s Show (1998)
1 mistake in The Kids Are Alright
Starring: Mila Kunis, Ashton Kutcher, Topher Grace, Danny Masterson, Laura Prepon, Wilmer Valderrama
Red Foreman: Steven, when are you moving out?
Hyde: Soon.
Red Foreman: How's your girlfriend?
Hyde: Shallow as hell.
Red Foreman: Job?
Hyde: Dead-end.
Red Foreman: Future?
Hyde: Bleak.
Red Foreman: Kitty, feed the boy.
[Kitty takes Eric's plate and gives it to Hyde].
Trivia: The show was originally titled "Teenage Wasteland" or "The Kids Are Alright" but those were songs by The Who and, legally, Fox couldn't get permission to use them. They renamed the show "Feelin' Alright" to show the focus groups. However, nobody really liked the name. After the focus groups airing, the audience were heard saying they really liked that show about the 70's or that 70's show - and the name stuck.
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Answer: It's Ashton Kutcher's dog.