Writers/producers/co-creators Carter Bays and Craig Thomas are members of the band "The Solids," which performs the show's theme song "Hey Beautiful".

Marshall is from Minnesota.

Lily's nickname for Marshall is "Marshmallow". Marshall's nickname for Lily is "Lily Pad".

Ted's favorite musician is Otis Redding.

Ted is from Ohio, just like Josh Radnor.

Ted's middle name is Evelyn.

Alyson Hannigan's character on "Buffy the Vampire Slayer" (1997), Willow Rosenberg, once mentioned that she wrote "Doogie Howser, M.D." (1989) fanfiction as a girl. Hannigan went on to star in "How I Met Your Mother" (2005) with Neil Patrick Harris, who as a boy played Doogie Howser.

Alyson Hannigan, who plays Lily, is perhaps best known prior to starring in 'How I Met Your Mother' for her role on "Buffy the Vampire Slayer" (1997). The creators of both of these shows - Joss Whedon of the Buffy series and Carter Bays and Craig Thomas of HIMYM - all graduated from Wesleyan University, as well as did the characters Lily, Ted, and Marshall on HIMYM. Additionally, Hannigan's character from the Buffy series, Willow, got early acceptance to Wesleyan, along with many other schools.

Ted's favorite movie is Star Wars: Episode IV - A New Hope (1977). His least favorite movie is The Goonies (1985).

Several cast members have also worked with Joss Whedon, notably stars Alyson Hannigan (Buffy the Vampire Slayer) and Neil Patrick Harris (Dr. Horrible's Sing-Along Blog). Also appearing have been guest stars Morena Baccarin (Firefly / Serenity), Alexis Denisof (Buffy the Vampire Slayer / Angel), Amy Acker (Angel / Dollhouse), Tom Lenk (Buffy the Vampire Slayer / Angel), and Harry Groener (Buffy the Vampire Slayer).

During one episode, Robin freaks out in a restaurant when she mistakenly thinks Ted is proposing to her after she receives a champagne glass with an engagement ring at the bottom. When Ted tells her "That's not mine", another gentlemen at the table behind them says "It's mine", then proceeds to propose to the woman at his table. The proposal between the man and woman was real. The man set up the whole scheme with the show's producers, and told his girlfriend that they won a contest and got to be extras in a HIMYM episode. Instead, he proposed on camera, and the proposal will live on forever as part of the episode.

Robin's full name is Robin Charles Scherbatsky Jr.

Another of the show's recurring gags is, whenever somebody says a phrase or word that resembles a military rank (eg. "Major buzz-kill") both Ted and Robin (and in some instances Barney, Marshall and Lily join in) salute and repeat whatever is said as though addressing a military officer ("Major Buzzkill").

Alyson Hannigan was pregnant while filming many season four episodes, but the producers were not interested in her character, Lily, also being shown as pregnant. Most episodes used time-honored TV tricks to hide Hannigan's pregnancy, including baggy tops and giant handbags, but the episode "The Possimpible" showed Hannigan's pregnancy bump in the context of a subplot in which Lily wins a hot dog-eating contest and has a comically distended stomach afterward. A similar visual gag was used in the sitcom "Titus" (2000) several years earlier. Actress Cynthia Watros was pregnant during the show's second season, although her character "Erin" was not meant to be pregnant. So, in addition to the "time-honored TV tricks" being used to hide Watros' pregnancy, a flashback scenario was used in one episode that showed her character Erin winning a pie-eating contest and her actual pregnant belly was shown after wards.

After Alyson Hannigan told the producers that she was pregnant, Cobie Smulders discovered that she was also pregnant. Neither of the characters they play were pregnant on the show, so the costumers had the job of simultaneously hiding the pregnancies of the series' two main female actors.

Before "How I Met Your Mother" (2005) started, Neil Patrick Harris and Josh Radnor had already acted together, as lovers in a Los Angeles production of the Jon Robin Baitz play "The Paris Letter".

Barney Stinson was named after a heroin peddler in the James Ellroy book LA Confidential.

Hanging on the wall of Barney's apartment set is a framed poster of the cover art for the 2001 novel Carter Beats the Devil by Glen David Gold. The novel is about a magician in 1920s San Francisco; Neil Patrick Harris, who plays Barney, is a talented magician.

The websites mentioned on the show are all real:,, and

Despite having a laugh track, the show is usually not filmed in front of an audience because of large sets. "Hooked" became the first episode to be recorded in front of a live audience because of traditional sets were used.

The search for all the main characters' so-called "doppelgangers" is a running joke throughout this series. In Alyson Hannigan's previous TV series, "Buffy the Vampire Slayer" (1997) doppelgangers were also a frequent theme of many episodes, and most of the major characters (including Buffy, Xander, and Hannigan's character, Willow) encountered doubles of themselves through plot contrivances of magic or alternate universes. The episode in which Willow meets her alternate-universe vampire double is even called "Doppelgangland."

When Neil Patrick Harris directed a 2010 limited-run production of the musical "Rent" at the Hollywood Bowl, he cast Wayne Brady in the role of Tom Collins. Brady and Harris had previously played brothers on "How I Met Your Mother" (2005).

Josh Radnor, Jason Segel and Neil Patrick Harris are each over six feet tall, making them one of the tallest male leads in a sitcom.

Co-creator Carter Bays said the limousine scenes were one of the hardest scenes to shoot because it took place in one set and the limo had to be dissemble apart in order to film inside.

The mother of co-creator Carter Bays is an ordained minister. Bays said he would only get calls from her if one or more jokes were not funny, despite the show's sometimes-risque material.

Each episode has either more or slightly less than 50 scenes, more than any traditional multi-camera sitcom.

Although their characters are all supposed to be the same age, Josh Radnor and Alyson Hannigan are actually 6 years older than Jason Segel in real life.

When both Samm Levine and Neil Patrick Harris were on " Kevin Pollak's Chat Show" (2009), Levine said that was called to audition "more than once" for the role of Barney Stinson, even though he himself thought that he was wrong for the role. Levine told Harris that he thought Harris was better as Barney than he would have been.

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