* AwesomeMoments: At the end of "Chicken A La Kotter", Kotter walks out after one too many nasty comments from his boss. He and the Sweathogs take their chicken and leave...but not before Arnold goes back in and puts the head of the chicken costume on the boss's head.
** Horshack talking down the suicidal Mary Johnson. In return, she saves his life when he slips and nearly falls off the same ledge she tried to jump from.
* HilariousInHindsight: John Travolta would later spend [[Film/BattlefieldEarth a whole movie]] with a rubber hose up his nose.
** In one episode, Freddie gives a JiveTurkey-laden speech about how he'd run things if he were president, talking a lot about change. [[UsefulNotes/BarackObama Hmm, sound familiar?]] Also doubles as HeartwarmingInHindsight.
* HollywoodPudgy: Judy Borden. The guys call her fat and make fun of her weight, but she's only a tiny bit thicker than the rest of the girls on the show.
* HoYay: Though the guys were most definitely straight, they had their share of moments. Most notably Horshack constantly hugging Epstein and calling him "little Juan", or a season 4 episode where Vinnie asked Beau to "look at his body". Arnold and Vinnie also go way back to their toddler years, and Arnold sometimes acts as a MoralityPet to the normally clueless and self-centered Vinnie.
* RetroactiveRecognition:
** Creator/JohnTravolta as Vinnie Barbarino
** James Woods as a rival teacher of Kotter's
** Marcia Strassman (Julie Kotter) is also best known for playing Diane Szalinski in ''Film/HoneyIShrunkTheKids''.
** Robert Hegyes (Juan Epstein) is also best known for playing Det. Manny Esposito on ''Series/CagneyAndLacey''.
** Debralee Scott had a recurring role as Rosalie "Hotsie" Totsie. Scott is best known for playing Cathy Shumway on ''Series/MaryHartmanMaryHartman''.
** Charles Fleischer also had a recurring role as Carvelli, before becoming [[Film/WhoFramedRogerRabbit Roger Rabbit]].
** Bob Claver directed 20 episodes. Claver is best known for co-creating ''Series/CaptainKangaroo''.
** James Komack directed three episodes, wrote an episode, and served as executive producer. Komack is best known as creator and executive producer of ''Series/ChicoAndTheMan''.
** Bill Persky directed an episode. Persky is best known as co-creator and co-executive producer of ''Series/ThatGirl''.
** Mel Stuart also directed an episode and also wrote an episode. Stuart is best known for directing ''Film/WillyWonkaAndTheChocolateFactory''.
** Al Schwartz also directed an episode. Schwartz is best known for creating ''Series/{{Dotto}}''.
** Eric Cohen wrote 16 episodes. Cohen is best known as co-creator and executive producer of ''Series/SoLittleTime''.
** Earl Barret wrote six episodes. Barret is best known as co-developer and co-executive producer of ''Series/TooCloseForComfort''.
** Royce D. Applegate wrote an episode. Applegate is best known for playing Chief Manilow Crocker on ''Series/SeaQuestDSV''.
** William Bickley and Michael Warren also wrote an episode. Both are best known as creators and executive producers of ''Series/FamilyMatters'' and ''Series/StepByStep''.
** Pat Proft also wrote an episode. Proft is best known for co-writing ''Film/PoliceAcademy''.
** Garry Shandling also wrote an episode. Shandling is best known as co-creator, executive producer, and star of ''Series/ItsGarryShandlingsShow'' and ''Series/TheLarrySandersShow''.
* TheWoobie:
** Horshack, especially early on. He puts up with a lot of crap from the other guys and has little to no self-esteem.
** Beau, who reveals that [[spoiler:he's had a tough life before coming to Bucchanan high school, never really knew the father he talks up so much and feels he has to con people into liking him just to make friends. He ends up playing a prank in order to impress the Sweathogs and keep them as friends, but even that backfires when Mr. Woodman refuses to believe it was him and blames the other guys.]]