Alyson Hannigan was pregnant while filming many season four episodes, but the show-runners 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 How I Met Your Mother: The Possimpible (2009) 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 afterwards. After Hannigan told the show-runners 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.
Thank you, Linus.
In Single Stamina (2.10), Lily and Marshall are married at Barney's brother's wedding, as evidenced by the rings on her finger, and Marshall's reference to her as his wife. At the scene, Ted and Robin dance, which indicates that they might be still together, even though during Something Blue (2.22), in which Marshall and Lily get married, Ted and Robin are broken up. However, the fact that Ted and Robin are not tired at the wedding (having Single Stamina) while Marshall and Lily are tired (having Couple's Coma) indicates that they are broken up, just on good enough terms to dance with each other.
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