The two girls that were sitting with Lisa in the cafeteria in "1600 Candles" are named as Amy and Janet.
The rest of the Smiths only appear in one scene in the entire episode. Francine does appear again in the final scene and only Stan and Francine have one line of dialogue.
When Steve remarks to his friends that none of them have had girlfriends, Toshi remembers that he had a wife for a while, referencing to Svetlana from "Of Ice and Men".
When Steve is talking about who he has to convince to vote for Debbie, he mentions a group called "The Baggy Pants Mafia," which is a nod to the Columbine High School shooting, where the shooters were thought to be part of a group called the "Trench Coat Mafia."