HIMYM prop master David Baker confirmed via Twitter that they also shot a scene in which Robin is performing "Let's Go To The Mall" at her wedding reception with The Mother's band, Superfreakonomics. This too was cut from the final aired episode.
The episode was trimmed by 18 minutes because it was too long.
Following extremely negative fan reactions towards this episode, the show's conclusion, the creators decided to release an alternate ending. It's included on the entire series and final season DVD releases, and can also be found on YouTube.
This is the only episode in the entire series in which the narrator is Josh Radnor (Ted) instead of Bob Saget (future Ted).
In the group picture taken by The Mother, they are sitting in the exact same order as the group picture in the opening credits (Marshall, Lily, Ted, Barney and Robin, from left to right).