The car salesman is played by Jaleel White who starred in Family Matters, a popular 90s sitcom.
The first book in the "Harry Potter" series, "Harry Potter and the Philosopher's Stone," was published on 1 Sep 1998. On 25 Sep 1998, Sammy Sosa had 66 home runs while Mark McGwire had 65 runs; McGwire hit his 66th home run later that same day.
The song that plays during Louis's RV fantasy montage is the theme song from Full House, a popular 90s sitcom.