The movie Doug stole his line from ("McCormick and Jo-Jo") doesn't really exist.
When Carrie and her girlfriends walk into the store so that Carrie can get Doug an engraved beer mug there is a guy with glasses who tells the the store clerk thank you before grabbing his merchandise and leaving the store. That man is Dave Price a local New York weatherman who at the time worked for WCBS in New York. He appears in this episode in an uncredited cameo.