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 character mistake in season 6 - chronological order
Starring: Mila Kunis, Ashton Kutcher, Topher Grace, Danny Masterson, Laura Prepon, Wilmer Valderrama
Visible crew/equipment: In the scene in Bargain Bob's where Donna is talking to Bob, the end of the set and lights can be seen in the reflection of metal cookware that Bob is tying balloons to. (00:07:50)
Kitty Forman: Oh good God, you kids switch partners more than square dancers!
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.
Question: Who exactly shouts, "Hello Wisconsin!" at the end of the opening credits? I've long assumed it was Topher Grace, but it sounds as though it could be Danny Masterson or Ashton Kutcher as well.
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Chosen answer: Danny Masterson is the one who screams "hello Wisconsin".