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 deliberate mistake in Season 6 generally - chronological order
Starring: Patrick Duffy, Brandon Call, Suzanne Somers, Staci Keanan
Genres: Comedy
Continuity mistake: The layout of Frank and Carol's house is inconsistent with the exterior shots. The driveway as seen from their backyard is more shallow and narrow than what is shown in the exterior shots, and the stairway to the left of their front door has a window halfway up, but the exterior shot shows a low section of roof that would completely obscure any window.
Jean-Luc: What do you think?
Carol Foster Lambert: I think you look like Barbara Eden from "I Dream Of Jeannie."
Jean-Luc: Well, I think you look like Crissy from "Three's Company".
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.
Carol and Frank continued to tell people they had seven children throughout the remainder of the show's run, but they never referred to Brendan after season 6.