Edit: When Amita enters Charlie's office at 6:20, it's not a t-shirt you see but shadow.
Amita enters Charlie's office at 6:20. She is wearing a blue on blue striped shirt with a black t shirt underneath. After first panning to Charlie, when they cut back to Amita at 6:34 she is still wearing the blue on blue striped shirt but is no longer wearing the t-shirt underneath it.
While closely studying an off screen picture, Larry is talking to Charlie about the Oort Cloud and Comets. We then see that he is actually looking at a picture of a Galaxy. Comets come from the Oort Cloud which surrounds our Solar System, these are an infinitesimal detail when compared to a Galaxy.