Family Ties (1982)

Dear Mallory - S6-E3

Continuity mistake: Mallory starts reading one of her advice column letters to Alex. The letter she pulls from the stack is on blue paper in a blue envelope. After a cuts to Alex, there's a close-up of Mallory as she reads the letter, and then in the next wide shot the letter is on orange paper with an orange envelope. The letter is from a girl who intrigues Alex, so he grabs the orange envelope and starts to tear off the return address. The shot changes to show Elyse walk into the room, and Alex is now tearing the corner from the original blue envelope. When Elyse sits down, Alex reads the address holding a slip of the blue envelope, then starts to get up. In the immediate cut that follows, Alex is holding the orange envelope when he stands up. (00:53:50 - 00:54:55)

Vader47000

Alex P. Keaton: Remember when we were kids and I ran you over with my bicycle?
Erwin 'Skippy' Handleman: Yes.
Alex P. Keaton: I have a car now.

Trivia: Michael J. Fox wasn't the original choice to play Alex. Fox was cast after Matthew Broderick backed out, not wanting to commit to a TV series.

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Question: I remember an episode where Alex does the grocery shopping for the family and comes home with groceries and more money than when he started out. Elyse (Mom) says to Alex "I only gave you $20" and Alex replies that he used coupons and went on double coupon day or something like that and after the trip the store ended up owing him money. I can absolutely remember this part but have rewatched every episode (I think) recently and cannot find it. Does anyone else remember this part or episode?