[Dean and Richard get in their cars and drive off.]
LORELAI: Don’t you feel like one of us should’ve been standing between them waving a flag or something?
A reference to the 1978 film Grease, previously mentioned. When Danny Zuko’s (John Travolta’s) gang the T-Birds have a drag race with rival rang the Scorpions, Cha-Cha (played by Annette Charles), one of the Scorpion’s girlfriends, starts the race by standing between the two cars waving a “flag” – actually a scarf or bandana.
The Annotated Gilmore Girls 