Deliberate mistake: Lily was an infant for all of season 5, but beginning with this season, she is around 5 years old. The show didn't jump forward in time, because JT states in a season 5 episode that he is 19, and in the episode this season where he and Rich go to Mexico, he states that he is almost 20, as well as Al and Mark are both still in high school.

Step By Step (1991)
1 mistake in Season 6 generally
Starring: Brandon Call, Patrick Duffy, Staci Keanan, Suzanne Somers
Genres: Comedy
Cody Lambert: Woah! A Canadian penny! Now I can buy bubble gum! That is, if I go to Canadia.
Trivia: Sasha Mitchell was dismissed from the show after the fifth season due to allegations of spousal abuse. It was later revealed that Mitchell's wife at the time would abuse their children in drug-induced rages and that Mitchell would intervene to protect them. Mitchell would later be brought back in a guest appearance in the show's penultimate episode.
Question: Did they ever explain what happened to Brendan, who was missing this season?
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Answer: According to the SBS website, Brendan's disappearance was never really explained. He just kind of faded out. He was hired as the cute "little" one and as he got older he wasn't as cute. When the Lamberts had the little girl, they got their cuteness factor back and didn't need as many kids around.