When Tim is grilling Alex about her car skills and knowledge, he mentions that Brad's car is a Shelby GT350-H which was based on Ford's 1965-'66 Mustang fastback. (In a previous episode, Tim and Brad settled on a $4500 purchase price - at the time that show aired, that car would have sold for $45,000 in decent condition!) Carroll Shelby de-tuned 1500 Cobras for sale to Hertz, a leading rental-car company which wanted to appeal to the youth market by offering "rent-a-rockets." The idea never took off, as the cost of mandatory insurance coverage made the car too expensive for most people. The "H" in the GT350-H's name denotes the Hertz connection; while having fewer horsepower than a "real" Shelby GT-350, the car was easily capable of exceeding 100 mph and Hertz spent a lot of money repairing collision damage. They soon dropped the offering. Surviving examples are scarce and valuable as of 2020.
When Tim Allen and Patricia Richardson were filming the scene after Tim gets home from their anniversary dinner Tim was worried about the reaction of Patricia/Jill so he stopped taping and asked her if everything was OK to which she told him that she was acting and everything was OK.
The title refers to the 1953 pop song "Young at Heart" with music by Johnny Richards and lyrics by Carolyn Leigh and made a big hit by Frank Sinatra.