Continuity mistake: In the opening segment, as Heidi hands Tim his hot-air gun, he takes it with both hands, then lets go with his left so he's only holding the gun in his right hand. The angle changes, and Tim is once again holding the gun with both hands, before he once again removes his left hand.

Home Improvement (1991)
1 continuity mistake in Sisters And Brothers
The Karate Kid Returns - S6-E14
Other mistake: When Tim and Wilson are talking about The Beach Boys song lyrics, Wilson says he wrote a book called 'The Psycho-Physiological Indices of Amorous Connections Among Termites of the Southwest' that sold four copies. In an earlier episode called Wilson's Girlfriend, the woman Wilson dates also says she wrote the same book with the same number of copies sold.
Heidi: Does everybody know what time it is?
Question: In one episode, Tim's mother says that she raised five boys. Three of those are Tim, Jeff, and Marty, but what do we know about the other two? There's another episode where Randy mentions his uncle that doesn't talk to their family anymore.
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Answer: Tim's other brothers are named Rick and Steve. They never appeared on the show, and were only mentioned in passing.
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