Anvilicious: The scene and speech at John's birthday party.
Fanon: Fans seem to agree that Beth is at least Bi.
Fan-Preferred Couple: There isn't much fanfiction for it but 60% are Kate/Beth and probably 39% are Kate/John with Scott being part of the other percent.
Fridge Horror: The girls trying to work out who Kate is by asking if she took a year off last year to go into rehab, then for bulemia or fat camp. Brittany Snow actually suffered with eating disorders in high school and appears fine - if someone had genuinely just come out and asked those things, well, it sounds really insensitive. Good thing Snow's ever the professional.
Hilarious in Hindsight: The Tucker brothers, John and Scott. John is hugely popular while Scott is widely ignored. Nowadays Penn Badgely is a popular actor while Jesse Metcalf has diminished in popularity.