During Ted's last flashback, Molly gets out of the bed wearing jeans followed by a shot of her putting the jeans on.
In the episode where the gang tells each other their flaws, it's revealed that Marshall is not capable of winking. However when Marshall tells Katie to stay away from drugs except pot, he winks twice.
During the flashback of Ted's first time with Molly, when she lifts the covers and says, "Look I gotta go," she is wearing her jeans. In the next scene, she is only in underwear and is putting her jeans on.
At the end of the episode Barney tells us he lost his virginity to Rhonda and for 2 weeks his comforter smelled like menthol cigarettes. However in the episode where the gang signs up for a gym, Barney loses his virginity and it happened at Rhonda's house and not Barney's.