1. Seth McFarlane
Season 2, Episode 21 and Season 3, Episode 11
Seth McFarlane actually appeared in two episodes as two different characters. First as Zach, Lorelai’s judgmental fellow graduate from community college.He came back in the next season to voice a message on Lorelai’s answering machine from her mother’s lawyer.
Even if you don’t recognize his face there’s no mistaking that voice.
2. Jon Hamm
Season 3, Episode 5
Lorelai attends an auction with her mother where she has a meet-cute, and later a terrible date, with a pre-Mad Men Jon Hamm. In the end it’s probably best that things didn’t work out between her and Don Draper. If he’d become Rory’s step-father things would just be awkward now that she’s had a short but torrid affair, and now real life engagement to his frenemy Pete Campbell.
3. Max Greenfield
Season 4, Episode 4
Before he was Schmidt, or even Leo, Max Greenfield attended Dean’s bachelor party which came to an abrupt end at Luke’s diner.
“Hey, my name’s Luke, too. We should start a club or something.”
4. Nick Offerman
Season 4, Episode 7 and Season 6, Episode 4
Jackson’s brother Beau Belleville makes two appearances. The first gives us an early glimpse of classic Swanson grumpiness. By his second visit he seems to be under the influence of Tammy 2.
5. Danny Pudi
Season 6, Episode 13 &14 and Season 7, Episode 6 & 7
Before he was a socially awkward student at Greendale Community College, he attended Yale as Raj and worked on the Yale Daily News during Rory’s stint as editor. Just look how far his fictional education has fallen. I blame the fictional economy.