Factual error: Kelso is wearing a t-shirt with Dirty Harry on it saying "Go Ahead, Make My Day". Sudden Impact was the first Dirty Harry movie to use that expression and that film didn't come out until 1983.
That '70s Show (1998)
1 mistake in Trampled Under Foot
Starring: Mila Kunis, Ashton Kutcher, Topher Grace, Danny Masterson, Laura Prepon, Wilmer Valderrama
Fez: Having sex with someone you work with is horrible. I don't know how Donny and Marie do it.
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.
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Answer: It's Ashton Kutcher's dog.