Party Favor - S2-E13
Visible crew/equipment: When Doug goes back to the house after unsuccessfully scraping the frost off the car, a stage light is reflected in the window to the right of the front door. As Doug approaches the door his own shadow passes over this reflection. (00:01:30)
Frozen Pop - S2-E15
Revealing mistake: When Doug goes out to scrape frost off the car, we can see he casts 2 shadows from different stage lights as he comes down the steps as well as on the hood of the car. (00:01:00)
Party Favor - S2-E13
Continuity mistake: At the beginning when Doug is putting his jacket on to go outside to scrape frost off the car, the lamp in the corner of the living room is off. In the next shot from outside the lamp is instantly on and when can see Carrie did not turn it on. (00:00:50)
Continuity mistake: At the ball game right before Carrie gets to the front of the concession line, there is a woman right behind here followed by a man. When she gets to the front of the line, the extras behind her have switched.
Frozen Pop - S2-E15
Visible crew/equipment: When Doug is scraping the car, watch carefully and you can the the reflection of someone off screen behind the camera move. (00:01:10)
Continuity mistake: When Doug and Ritchie are waiting for Spence, the amount of beer in Doug's glass keeps changing. (00:04:30)
Dire Strayts - S2-E8
Continuity mistake: When Carrie is in the attic and notices the rat, the cobweb that is by her head disappears instantly. (00:17:05)
Dire Strayts - S2-E8
Continuity mistake: When Doug and Carrie are arguing just before Ray and Deborah get there, the position of the paint brush in the sauce Doug has made changes between shots. (00:06:30)
Dire Strayts - S2-E8
Visible crew/equipment: When Carrie asks what Deborah is like, on the cupboard door above Doug you can see the reflection of a boom mic moving around. (00:04:45)
Dire Strayts - S2-E8
Visible crew/equipment: When Doug says about watching the game at his on the big screen, a boom mic drops into shot very quickly. (00:01:45)
Frozen Pop - S2-E15
Continuity mistake: Carrie says that her finger have broke off into her gloves. When she does, the ice scrapper in her hand changes hand instantly. (00:00:20)
Move Doubt - S8-E8
Visible crew/equipment: Season 8, episode 8 "Move Doubt": When Carrie and Doug leave Kelly and Deacon's apartment, you can see the shadow of a boom mic on the wall to their left.
Visible crew/equipment: When Carrie and Doug head out to the garage the first time, a boom mic is reflected in the door's glass. (00:04:05)
Party Favor - S2-E13
Continuity mistake: At the start, Doug has a spatula in one hand and a whisk in the other. Camera does an instant cut and they have swapped hands. This is not to be confused with when he is messing about and you see him swap the items between hands. (00:00:50)
Continuity mistake: When Doug and Carrie are arguing over Arthur having a house, the head on Doug's beer keeps changing size. (00:02:00)
Continuity mistake: When Doug and Carrie are arguing about not having gone out for pizza, Carrie has her pen in her hand, but when it cuts it's now on the desk. (00:10:30)
Visible crew/equipment: When Carrie says about going back in time, a boom shadow can be seen moving over the wall. (00:02:30)
Continuity mistake: When Doug is going into the living room after Carrie has gone in search of Arthur, his left hand is on the door. When he goes through the door, he is opening it with his right hand. (00:14:00)
Visible crew/equipment: When Doug says that Carrie is making progress with her room, a boom shadow can be seen moving along the door. (00:03:30)
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.