In this episode it is revealed that Barney and Robin's wedding is on May 25th. May 25th also happens to be the same day that both the original Star Wars and Return of the Jedi movies were released. Star Wars is one of Ted, Marshall, and Barney's all time favorite movie trilogy as mentioned in many episodes.
In the episode where Ted and Lily argue about if there should be a band or a DJ at Barney and Robin's wedding, Ted votes for a DJ. However, in the very first episode before Ted meets Robin and talks to Carl's Lebanese girlfriend, he points out that in his opinion, a band is better.