French Stewart (Chef Rudy) and Kristen Johnston (Tammy) also worked together in 3rd Rock from the Sun (1996). However, they have no scenes together in this episode.
Christy orders to the $9 pack of cigarettes and one dollar's worth of gas. That would give her 42.6 ounces of gas, 1/3 of a gallon at California gasoline prices in 2018.