Pee-wee's Playhouse (1986)

Monster in the Playhouse - S1-E9

Revealing mistake: As Reba the Mail Person exits the Playhouse, she goes past the window, and you can see her exit the sound stage through a door painted the same as the background.

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Monster in the Playhouse - S1-E9

Revealing mistake: As the monster hops from behind the snack island, the actor's white shoes can be seen for a moment. (00:30:00)

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Reba Eats and Pterri Runs - S3-E1

Visible crew/equipment: As Pterri comes around to Reba's left side, the puppeteer's hands can be seen behind her back for a moment.

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Jambi: Mekka Lekka Hi-Mekka Hiney Ho.

Salesman: I'm going door-to-door to make you this incredible offer.
Pee-wee: Aaaaaaaaaaaaaahhhhhh! salesmen.

Pee-wee: You all remember what to do whenever anybody says the secret word right?
All: Scream.
Pee-wee: That's right. For the rest of the day, whenever anybody says the secret word, scream real loud. Ready? Let's try it.