Al is seen wearing a wedding ring on his left hand even though the character is portrayed as unmarried. In real life, Richard Karn is married to Tudi Roche, who had a recurring role as Jill's sister Carrie.
Say, do you think they call it a nail gun because it shoots nails?
Al's girlfriend, Ilene is first introduced as Ilene Markum. But in 'Dream On' the credits says that her character is Ilene Martin.
Most episodes featured outtakes from either Tool Time or the show itself as a backdrop to the closing credits.
The syndication version of the episode "I Was a Teenage Taylor" [6.7] contains a scene previously unincluded in the primetime version in which Tim brings his Halloween guy to the Tool Time set.