If you look closely at the background of this scene from 2012, you will see something from the future. On the TV behind them there is an ad for the 2016 film Why Him. Did we miss some sort of time traveling plot in the show or are they just messing with us?
Next time you watch the show look at the clocks in Lily and Marshall's apartment. Every single clock in their apartment is set to 4:20. No matter what time it is on the rest of the show, in the rest of the scenes, it is always 4:20 at their place.
If you look in the background of this flash-forward scene to 2029 you will see a framed headline. And if you look even closer you'll see that the headline reveals that Marshall captured the Loch Ness Monster. I guess we've solved that mystery.
The show wound up being one big family affair. Alyson Hannigan’s husband Alexis Denisof, played Sandy Rivers. Cobie Smulder’s husband, Taran Killam, played Blauman. And Neil Patrick Harris’ husband, David Burtka, played the character of Scooter. Sounds like a fun cast!
You will rarely see Barney in anything but a suit. In fact, there are only 12 times in the entire nine seasons of the show where Barney doesn’t “suit up." Here is a funny breakdown of how many suits he owned and how much money Barney would have to make to be able to afford all those suits.
You may have noticed that while Lily and Marshall are an adorable couple, they rarely kiss. Alyson Hannigan requested that the kisses between her character and Marshall be scripted as infrequently as possible because Jason Segel was a smoker. No one wants to kiss a smoker. Even if you are getting paid to do it.
In Season 1, episode "Zip, Zip, Zip", we find out where Ted, Marshall and Lily live. According to the episode, their apartment is on 75th and Amsterdam. For a guide of more locations from the show, check out this location guide.
In order to hide real-life baby bumps, the writers have to get real creative. When Alyson Hannigan was pregnant they went to great lengths to hide her belly. They even had a scene where she ate 29 hotdogs and grew a food baby.