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)
Queasy Rider - S2-E1
Revealing mistake: When Doug comes in at the start and says he has been riding Ritchie's hog, all the stage lights can be seen in Carrie's wine glass. (00:02:20)
Continuity mistake: Carrie tells the preacher that she and Doug met at a bar. When she hears the lie about her falling on Doug as a kid, she believes it and acts as if that was their only meeting before the bar. But in the episode "Road Rayge", she mentioned a junior high school dance where Doug asked her to dance.
Queasy Rider - S2-E1
Other mistake: When Arthur is telling Doug that he had a bike, you can see and hear a bright light switch on in front of them.
Continuity mistake: When Doug talks about sleeping on his mitt, the way he holds it changes instantly. (00:00:45)
Continuity mistake: When Carrie is starting her new work position, her bag on the desk behind her moves without anyone touching it. (00:04:20)
Queasy Rider - S2-E1
Visible crew/equipment: When Doug is looking at the bike for the first time, all the stage lights are reflected in the helmets on the table. (00:06:00)
Continuity mistake: When Doug and Carrie are talking in the kitchen after Doug tried the Sgt. Salty cereal, you can see the cereal box disappear and then reappear on the table behind them. (00:12:45 - 00:13:35)
Continuity mistake: At the start when Carrie walks into the kitchen she opens the door with her right hand. However from the kitchen angle she is opening the door with her left hand and her right is down by her side. (00:03:10)
Character mistake: The woman in the store claims that the umlaut on the shoe size indicates a half size in Europe. This is wrong because the European shoe size system (used in Germany among others) is completely different from the US system. Carrie's 6 1/2 shoes would be a size 39 according to the European system.
Visible crew/equipment: In the scene where Doug has been bubble wrapped and dumped out in front of IPS, Deacon leans over talking to him and you can see a boom mike shadow over Deacon's shadow in the background.
Continuity mistake: Right at the start, the salad cutlery keeps crossing and uncrossing itself. (00:01:05)
Mammary Lane - S5-E5
Visible crew/equipment: When Denise is running away and Doug is on the floor, a camera shadow is very clear on Denise's car. (00:21:30)
Visible crew/equipment: When Carrie hugs Doug and wishes him good luck, you can see the battery pack for her mic in her jeans. Clear as day. (00:17:35)
Answer: Sara hasn't been mentioned in later episodes, and it suggested in later episodes that she never existed, and that Carrie is an only child. Kevin James stated that the producers couldn't think of an good plots to use with Sara, so they left her out.