Visible crew/equipment: There is a man's elbow on the right of the screen near the start when only Jamie and Hal are in the room. (00:02:49)
Continuity mistake: In the scene where the grandma is talking at the table with Reese and Malcolm, notice the bottle on the table next the the grandma, between takes the cork from the bottle goes from being on top of the bottle to next to the bottle, it changes in almost every different shot.
Continuity mistake: Hal shows Dewey that he fixed the microwave so that it works with the door open. There is a red cloth inside. Hal then shuts off the microwave and when he and Dewey start talking the cloth changes position from shot to shot.
Other mistake: Lois wins the truck, which is never seen again.
Suggested correction: Just because we're not told what happened to the truck doesn't mean a mistake occurred. There's a number of valid reason we don't see it again (especially when only 3 more episodes were produced in the series).
Revealing mistake: When Kristen starts taking her helmet off you can see her hair is actually a wig.
Continuity mistake: When Lois goes outside to meet Hal at the clothesline, she leaves the door open. In a few shots during their conversation, the door is closed in the background. (00:06:20)