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)
Visible crew/equipment: In the garage, when Spence says "so Deacon" there is a shot of Danny in the chair with a taper marker in front of him. (00:06:30)
Visible crew/equipment: During Spence and Danny's fight scene, there are a couple of shots where you can see Danny's mic pack on his belt. (00:16:20)
Continuity mistake: When Doug spots the chicken he has his gun down by his side in the first shot and raised in the second shot. (00:18:40)
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.