Deliberate mistake: When Frank tosses the cards in the end they all hit the camera very obviously. When the episode first aired the last scene was in 3D, which is why he tosses them directly at the camera like that.
Step by Step (1991)
1 mistake in How the West Was Won - chronological order
Starring: Patrick Duffy, Brandon Call, Suzanne Somers, Staci Keanan
Genres: Comedy
Gabrielle, Mark's girlfriend: Be still, my heart.
J.T: Be still, my lunch.
Question: Did they ever explain what happened to Brendan, who was missing this season?
Answer: The actor that also played Brendan quit acting altogether.
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.