The Ingersolls, who live in Southern California, are seen drinking Coors beer. At this point in time, 1969, Coors was not a national product and was found mostly in the Western United States, as well as parts of the South and Midwest, all west of the Mississippi. Due to it being unpasteurized, it wasn't allowed to be sold in most of the Eastern and Southeastern States, and wasn't sold east of the Mississippi at all until 1981, and not nationally until 1986. This is the premise of the 1977 film Smokey and the Bandit (1977).
During an early bedroom scene, an instrumental version of "We've Got a World that Swings" from The Nutty Professor (1963) is used on the soundtrack, that movie which also stars Jerry Lewis.
Peter Ingersoll's pseudonym is Fred C. Dobbs. That was the character name of Humphrey Bogart in The Treasure of the Sierra Madre (1948).