In Season 2, Episode 17, while helping at the diner, Lorelei tells Luke he should number his tables. In this episode, Luke tells Zach "take those plates to table 5".
Rory says to Logan at one point, "I have to change in the back of your car, Dirty Dancing style." This is interesting because Kelly Bishop who plays Rory's grandmother in the show, has a large role in Dirty Dancing as Baby's mother.