Establishes that Granny's birthday is sometime between Thanksgiving and Christmas.
Custom car designer George Barris is listed in the credits as a Production Assistant.
Jethro (Max Baer, Jr) pays $18,000.00 (plus trading in the old truck) for a futuristic car. The $18,000.00 in 1968 would be the equivalent of paying $134,000.00 in the year 2020.