When Spence is describing why he can't eat peanuts ("My body doesn't like this and my throat gets real small") Kirby's hands are mimicking the lines along with Spence because he already knows what Spence is going to say. See more...
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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.