Continuity mistake: The unibrow drawn on Jackie changes between the time we first and last see it. It's thicker the second time.
That '70s Show (1998)
1 continuity mistake in Tornado Prom - chronological order
Starring: Mila Kunis, Ashton Kutcher, Topher Grace, Danny Masterson, Laura Prepon, Wilmer Valderrama
Punk Chick - S1-E22
Other mistake: Jackie and Kitty are baking a pie in the kitchen and Kelso walks in. Jackie and Kelso have an awkward encounter as if they are separated, but they got back together at prom.
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: In the fifth episode of the first season, Donna is left alone to babysit her little sister Tina. Both Tina and Valerie, Donna's older sister, were written off the show, much the same way as Richie's older brother Chuck, on Happy Days, or Laura's younger sister Judy, on Family Matters.
More questions & answers from That '70s Show
Answer: It's Ashton Kutcher's dog.