Marcy comments to Steve "I though you were out in the desert protecting the wildlife and performing your version of Guys and Dolls to the cactus.
This is an inside joke as David Garrison departed the series to do theater.
Jefferson has a job at the car wash and the apron he wears reads "Traugott's House of Scrubbin'." Walter Traugott was the man who Jefferson supposedly had killed while watching a baseball game in The D'Arcy Files (1994) because he knew of Jefferson's past as a spy.
After checking the lost and found, Kelly says she found a nice Plymouth, which Al replies, "I don't want a Plymouth, I want my Dodge, dagnabit!" In reality, the car serving as Al's Dodge is a Plymouth Duster.
When Al goes to the trunk of the Dodge to see if anything was missing, you can see clearly the original color of the car - a dark gold/bronze.