In the DVD commentary, creator Marc Cherry says that he originally wrote Trip running for office and Bree as her First Lady. It was at Marcia Cross' request that he changed it and put Bree into politics.
The trivia items below may give away important plot points.
The final scene of the show brings back nearly all of the characters who have passed away throughout the show as Susan drives around Wisteria Lane one final time. - Roger Bart as George Williams - Justine Bateman as Ellie Leonard - Emily Bergl as Beth Young - Richard Burgi as Karl Mayer - Jonathan Cake as Chuck Vance - Maria Cominis as Mona Clark - Steve Culp as Rex Van De Kamp - Ellen Geer as Lillian Simms - Valerie Mahaffey as Alma Hodge - Kiersten Warren as Nora Huntington - Lupe Ontiveros as Juanita 'Mama' Solis - Katherine Joosten as Karen McClusky - James Denton as Mike Delfino.
Although Nicolette Sheridan did not appear as Edie Britt in the final scene amoung the ghosts, it is referenced that she is there. Mary Alice states that all of the ghosts from the street were there watching Susan as she left. Therefore, Edie must have been there.