Home Improvement (1991) - 7 major mistakes

Revealing: Anytime the kids are shown running through the backyard, it sounds very obvious they are running on a wooden set floor instead of real grass-covered ground.

Visible crew/equipment: At the beginning episode 5.9, "Chicago Hope", the camera and several studio lights reflect on the glass door behind Tim as he sits at the dining room table.

Deliberate "mistake": When Jill turns off the light to Randy's room, she uses the same switch that Al used to activate the reverse laundry chute.

Continuity: In one of the episodes, Tim goes out to talk to Wilson. When he gets to the fence he picks up a football. When the camera cuts to Wilson, then back to Tim, the football is gone. Then the camera goes to Wilson and back to Tim. He has the ball again.

Continuity: When Randy takes the phone from Mark, as he starts to turn away he lifts the phone to his ear. The angle changes and he is now holding the phone in front of him as he walks over to the magician's box and jumps up on it.

Revealing: When Wilson and Tim start to talk they sit down on some rocks. If you look at Wilson's foot you can see the sheet of fake snow caught under his foot.

Revealing: At the beginning during the Binford commercial, Tim falls off the ladder that they just set up and it's possible to see it's connected to the wall (so it will flip, but not fall over).