Revealing mistake: Just before the dish explodes out of the dishwasher through the wall the cut out that was made to allow that to happen is visible.
Continuity mistake: When Tim is watching Tool Time, Jill comes over and turns off the TV. At one point the remote suddenly appears on the couch, the next shot the remote has moved.
Answer: No the guy sent in a picture of himself because he thought he looked like Al. So they brought him on the show as his brother.
Bowling255 ★