All ofLyndsy FonsecaandDavid Henrie's scenes as Ted's (Josh Radnor) future children were filmed during the first season to keep them the same age throughout the series. This includes a scene for the show's final episode filmed early in the second season.
The husbands of the three main actors have appeared on the show, each time as the significant other of another leading actor.Alyson Hannigan's husbandAlexis Denisofplays Robin's coanchor Sandy Rivers;Cobie Smulders' husbandTaran Killamplays Blauman, who might have a crush on Ted; andNeil Patrick Harris' husbandDavid Burtkaplays Lily's ex Scooter.
There are only 18 times throughout the entire series that Barney (Neil Patrick Harris) shows up without a suit. (However, these are often other suits, e.g., a snowsuit or a flight suit.)
After the show ended,Josh Radnorkept the blue French horn,Neil Patrick Harrisgot the Playbook and the gang's MacLaren's booth, and the three yellow umbrellas now belong to the directorPamela Fryman,as well as creatorsCraig ThomasandCarter Bays.