Continuity mistake: In the second episode of the series Eric's Birthday is in May. The second episode of season 5 Eric says his birthday is in March. In season 6 Eric's Birthday occurs after graduation, which would make his birthday after June.
That '70s Show (1998)
1 continuity mistake in show generally
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: 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.