Fixer Upper - S1-E12
Continuity mistake: After Spence suffers from his allergic reaction to peanuts he's seen lying on the couch. Doug then says something to the effect of having to scrape Spence's lunch off the fence, indicating that he threw up. But the allergic reaction took place before they got to the lunch.
Queasy Rider - S2-E1
Revealing mistake: When Doug comes into the garage the first time, if you look through the garage door, at the end of the fence is a very noticeable crease running vertically. This shows the outside is a fake. (00:06:55)
Wish Boned - S7-E17
Audio problem: When Doug found Arthur after his running away and they were about to board the plane to St. Louis, Arthur's voice sounds fuzzy because the new T-shirt he's wearing is covering the microphone on his chest.
Other mistake: During the picnic softball scene, there are mountains in the distance. There are no mountains in or near Queens New York. (00:05:40)

Continuity mistake: Arthur and Doug are sitting with beers in the basement. Arthur doesn't open his beer, but the sound of a bottle opening can be heard and suddenly his beer has foam all the way up to the top of the bottle. Arthur stands up and the bottle is still unopened. It cuts to Doug, then back to Arthur with no beer at all. Again it cuts to Doug, then back to Arthur, and he is holding the unopened beer again. (00:18:30)
Revealing mistake: When Arthur is looking in Carrie's bag, there is one shot with a blue kettle next to the bag. 10 stage lights can be seen reflected in the kettle. (00:11:50)
Queasy Rider - S2-E1
Continuity mistake: When Arthur is telling Carrie he has got a job, Carrie is putting out paper plates. She puts all three out and then the camera changes angle. When it does, one of the plates has moved across the table and Carrie is seen placing it in position again. (00:10:40)

Fixer Upper - S1-E12
Continuity mistake: Doug finishes playing the tennis game on the TV with Arthur and goes into the kitchen to get the Cheese Doodles. While talking to Carrie, he puts the Cheese Doodle package on the table with a can of cola behind it. He then goes to get a glass from the cupboard and in the next shot you see the cola is in front of the Cheese Doodles. (00:17:30)

Continuity mistake: In the overhead shot when Carrie parks there is no-one around. From the internal shot, there are 2 people visible through the side windows. (00:00:40)
Revealing mistake: When Doug's mum is writing down the note about the T-11's, the writing is already on the pad. (00:14:40)

Continuity mistake: When Spence and Kirby are talking about why Spence can't make him a PB&J sandwich, the way Kirby holds the red action figure keeps changing. (00:06:15 - 00:06:55)

Visible crew/equipment: During the driving scene at 00:07:35 you can see a stage wall on the set to the right when the lights pass over the car. (00:07:35)
Factual error: It is very obvious throughout the whole episode that the mountain scenery is that of California wilderness...the trees, plants and mountains look nothing like those in New York or the East Coast.
Cheap Saks - S6-E15
Continuity mistake: Near the end of this episode, after Trish Flintoff leaves, Doug is telling Carrie and Holly that she's a nice person. Doug is looking at Carrie, then the shot changes and he is immediately looking down and reaching towards his back pocket. It also looks like he's trying not to laugh. (00:19:35)
Continuity mistake: At the start, the distance the canoe has drifted changes instantly. And it changes a huge distance. (00:04:20)
Continuity mistake: Outside shots of Coopers, upper half of each door has 9 windows. 3 sets of 10 windows on either side of doors. Inside Coopers, main doors are all glass and no windows on either side.
Home Cheapo - S9-E7
Continuity mistake: The Home Cheapo Series: In the scene where Deacon, Kelly, Carrie and Doug are silently debating over who will pay the bill, Doug pushes the bill over to Deacon and it lands diagonally in front of Deacon's beer. In the next shot the bill has changed positions without being touched.
Queasy Rider - S2-E1
Visible crew/equipment: When Doug is telling Carrie that he hates the bike, a crew member in blue jeans can be seen in the back of the mirror on the bike. (00:18:55)