Continuity mistake: In 2-21 Something Borrowed, Lily's high school boyfriend, Scooter, reveals his name is Bill, but this episode in a flashback he tells Lily his name is Jeff. (00:03:47)
Continuity mistake: In 5-22 "Robots Vs Wrestlers" future Ted narrates, " No matter if we fell out of the group, we always made it to Robots Vs Wrestlers. Hell or high water." In this episode, Ted is the only one who goes.
Continuity mistake: We find out in this episode that Ted and the mother don't get married for several years, due to postponing The Wedding when she became pregnant. They eventually get married in 2020, when their children are 3 and 5. But in Lobster Crawl (8-9), at the end of the episode Lily and Marshal show up to babysit Ted's daughter when she's younger than that, and Ted is wearing a wedding ring. (00:29:00)
Suggested correction: Many couples wear rings before their actual wedding as a display of commitment. A friend of mine is in this situation. He wears a ring, has a child with his lady, but no actual date for their wedding is set. This is simply Ted choosing to wear a ring before getting married and there is no mistake.
Continuity mistake: After telling the joke about the Teenage Mutant Ninja Turtles, Marshall's hands change between shots, from holding his hand for a hi-five to his pockets to holding the Skittles. (00:08:32)
Continuity mistake: When Lily is talking about how much of a badass she used to be, it shows her meeting Scooter. He said his name was Jeff, but in season 9 Lily says that Scooter's real name is Bill. (00:03:40)