Revealing mistake: At the beginning when Tim goes to throw the debris out of the window of the house they are remodeling, it's obvious that Tim is replaced with a stunt double.
The Karate Kid Returns - S6-E14
Revealing mistake: When the box falls on the kid's head, Randy and Mark run out of the store. When they run out, the mall stores in the background wave or move revealing that it's not an actual mall set but just a backdrop.
Revealing mistake: When the hot rod is back in the garage covered in "snow" - look at the color of the car, along with the door when the door is open. There is plastic on the inside of the door (probably to get all of the snow off so quickly) and the color of the hot rod is a lighter shade of blue then normal.
Continuity mistake: When Tim and Al are small and ejected from the vehicle, their coveralls are red, but when Tim is made human sized again his turns into a very dirty grey.
Ye Olde Shoppe Teacher - S4-E10
Continuity mistake: When Mark is sitting on the counter he has both legs hanging off the edge. The shot changes and now one is on the counter and one is hanging off the edge.
The Eyes Don't Have It - S4-E4
Continuity mistake: When Tim and Jill are talking about the letter from school, Tim is holding a can. The shot changes and he is no longer holding the can.
Continuity mistake: When Jill says "Tim, you are almost 40" Tim's hands are at his side, the shot changes and they are now in his pockets.
Continuity mistake: Tim breaks and knocks the crane that Al built off the table. The shot changes and part of the crane is back on the table.
Back In The Saddle Shoes Again - S4-E1
Continuity mistake: In the first scene in the kitchen the clock on the oven reads 12:17. A short time later it reads 6:44.
What You See Is What You Get - S3-E23
Continuity mistake: In the previous episode Tim built a gazebo and swing from the boys' old swing set. In this episode the swing set is back.
Swing Time - S3-E22
Visible crew/equipment: When Tim is telling the boys what Jill wants for Mother's day, the shadow of the boom mic is visible on the house behind him.
Continuity mistake: When Irma moves the post from the front burner to the back the pot is part way off the burner. The next shot the pot is completely on the burner.
Visible crew/equipment: When Wilson is trying to get a cat out of a tree, a boom mic is visible.
'Twas the Blight Before Christmas - S3-E12
Visible crew/equipment: When the camera pans over the decorated roof you can see part of the studio.
Visible crew/equipment: When Al brings Brad and Ashley downstairs the top of the set can be seen.
Continuity mistake: In the finale scene the can Tim is holding changes.
Continuity mistake: In the opening scene there is a shirt on a chair in the background that disappears half way through the scene.
Aisle See You In My Dreams - S3-E2
Continuity mistake: Tim is talking to Al after Tool Time. Al's shirt goes from not tucked in, to tucked in a couple of times.
Aisle See You In My Dreams - S3-E2
Continuity mistake: When Tim and Al are talking at Tool Time. Tim puts on a hat, the shot changes and he puts on the hat again.
Maybe, Baby - S3-E1
Continuity mistake: When Tim and Wilson are talking there is a hose and a ball in the background that change position.
Answer: In seasons 1 and 2, each Binford tool had a unique model number, but from season 3 onward, they were all numbered 6100 as a running gag.
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