Plot hole: Spence comes in with a pizza and says, "Let's hit this pizza hard and get out of here." But then later we find out there's a laptop in the pizza box. What if the guys actually wanted a slice? Also, after the guys leave for the movies, Carrie or Arthur would've seen the laptop in the pizza box. (00:05:35 - 00:06:55)
Revealing mistake: In the kitchen, Deacon asks Doug, "Are we gunna play basketball or what?" while leaning against the counter. In this shot you can see the kitchen wall is on an angle slanting away from the camera. This makes the kitchen look bigger and cuts down on the empty stage space on the wall where the cameras are. (00:07:00)
Continuity mistake: Deacon says "How do we know cutie-pie isn't cutie-guy?" then crosses his arms. In the next shot his arms are immediately uncrossed and on his hips when Doug replies. (00:06:00)
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.