Visible crew/equipment: In the opening scene, when Doug almost sits on Arthur, you can see part of the blue mat that Doug rolls Arthur off the couch on to.
Continuity mistake: When they are talking about Carrie only having one good ovary, the napkin under Doug's hand keeps changing position. (00:15:10)
Continuity mistake: Doug gets into a mess with the sellotape wrapping Carrie's Christmas present. However when she walks downstairs it's on the table, absolutely fine. (00:02:20)
Continuity mistake: The bag Doug puts on Arthur's hospital table is a lot bigger than the bag he got at Gabe's. We know it's not a different bag as he ran from Gabe's, and the bag says Gabe's on it. (00:19:00)
Continuity mistake: When scooping the ice creams for Arthur, Doug scoops pineapple, then banana, from the open case. He then finds lemon, but has to open the case again. (00:17:45)
Mean Streak - S4-E3
Continuity mistake: When sat at the table at the start, the bottle top keeps changing position in relation to the edge of the table. (00:03:00)
Continuity mistake: In the scene where Carrie and Doug are in the kitchen and Carrie is explaining why she wants to quit school, she fills a glass of water to the top of the glass. A few shots later, she sets the glass down on the counter without taking a drink and it is less than half full.
Audio problem: When Carrie taps Doug's chest and says to go and change, the sound of the taps is out of synch with the motion. Most noticeable with tap 3. (00:02:40)
Continuity mistake: When Doug is ringing Arthur at the beginning of the episode, there are 2 lunch boxes on top of the lockers behind Doug. During different shots 1 disappears and reappears. (00:00:45)
Continuity mistake: At the start there are 2 letters on the table in front of Arthur. When Doug rings for the 3rd time they have disappeared. (00:00:50)
Continuity mistake: Right at the start when Carrie gives a sigh, she shuts the menu. In the next shot it's back open. (00:00:25)
Continuity mistake: Carrie enters and says "Bad news", to which Doug replies, "Ya, if it's about being out of mini donuts, I'm aware and I'm not happy". However, in S7 E7 "Offtrack...Bedding" at the start of the episode Doug says he doesn't like mini donuts. (00:00:30)
Continuity mistake: When Carrie finds Doug in the kitchen in the middle of the night, her arms are crossed with her hands tucked into the sleeves. After she asks him about his pay check from IPS, the shot changes and her hands are now on her hips. (00:10:50)
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.