Continuity mistake: When Al comes home, he finds a written message from Peg saying that she, Kelly and Bud are at Marcy's house performing the Village People. However, Peggy couldn't have written the message because when they agreed to play the Village People, they went over to Marcy's immediately. (00:04:50 - 00:06:10)
Other mistake: Peg reads from a headline saying "[Marcy] announces NBC fall schedule, people still disappointed." But the text below it reads "State officials..." showing the text doesn't belong with that headline. Also when you see each headline the article is the same for each one.
Visible crew/equipment: At the end of the episode you can actually see a crew member at the door waiting for his cue to throw the tumble weed through the door.
Continuity mistake: When the chain is cut with Marcy by Al to release him from the pole, later in the newscast in the background they are showing the cut chain. When on the news, it shows the chain was cut about a foot from the goal post. However when you watch the guy cut the chain for real, he cuts it flush with the pole.
Revealing mistake: When the chain is cut from Al's wrist, you can see and hear that it's plastic not metal. (00:02:28)
Revealing mistake: When Kelly is at the house of the crazy guy who made the couch, when they drink the cappuccino and he throws the cup, it's clear that the cups are just props as the drink stays in when it falls towards the camera.
Other mistake: When Sonya takes off Bud's bandages on his arms you can see they aren't injured.
Other mistake: The guys push Bud out of the line and to the back. When they do that, there is a guy with a black and yellow jersey on with the number 25 in it. There were more guys behind him in the line. A little later, Kelly returns to the line where Bud is. All a sudden that guy with the black and yellow jersey with the number 25 is the person right in front of Bud.
The Legend of Ironhead Haynes - S8-E23
Other mistake: A lady comes in the shoe store and asks for a shoe in a certain size. She tells Al to hurry because she doesn't have much time. Al goes in the back to get her shoes. She sits there for 6 seconds then leaves. Why bother going to get shoes?
Answer: It was one of the hoses connected to the engine, nothing specific, but to indicate that Al tampered with the vehicle.