Factual error: When Donna and Randy are in Eric's bedroom, Randy is playing with Eric's toy lightsaber. However, the blade is green. No green lightsaber toys were produced until after the release of "Return of the Jedi", which occurred in 1983. Moreover, the handle is the modern style, not the vintage.
That '70s Show (1998)
1 mistake in Son and Daughter - chronological order
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.