Other mistake: When Harry spits baby food on the baby (the camera lens in actuality) in retaliation for the baby spitting food on him and Tommy, Joseph Gordon-Levitt breaks character and laughs uncontrollably and looks at and gestures to off-screen crew members a couple times. (00:06:25)

3rd Rock from the Sun (1996)
Episode list - season 1
More quotes from 3rd Rock from the Sun
Tricky Dick - S3-E3
Trivia: Dick's rant about his perceived evils of rock music is identical to Reverend Moore's (also played by John Lithgow) opposition to dancing from the film "Footloose."
Question: Which season/episode does Officer Don first appear as a permanent character?
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Chosen answer: Officer Don ended up appearing in 100 of 139 episodes, but I would say season 3 is when he become permanent as Wayne Knight's name appears in the opening credits. However, as he did appear throughout season 2 (first appearance S01E17), it's possible they already considered him permanent at that time since season 3's opening credits also included Simbi Khali (Nina) and Elmarie Wendel (Ms. Dubcek).
Bishop73