There were soooo many great costumes at the wedding. Here are a few more.
Ms. Lakeside with the Joker (all of the Lakeside employees who were helping at the wedding were dressed in beauty pageant sashes and tiaras. They were great!
Amy Winehouse, The Three Amigos, Yanni
Not shown, the Breakfast Club (4 party group costume), dead General Lee and his wife, bearded Bartman, and a Ghostbuster to name a few.
Also see HereHere, Here and Here.