There is a 7 year age difference between Abbi Jacobson and Clea DuVall in real life.
When Ilana and Abbi spot Alan Cumming, they list few of his movies including "Romy and Michele's High School Renuion". Jeneane Garofalo, who plays the vet in several episodes, played Cumming's character's best friend in "Romy and Michele's High School Renuion".