No, Tyler doesn’t really understand most of those terms. Yes, he was mostly guessing that Peter didn’t need most of those things.

G.A.C = Generalized Autocaster.

Yes, Kally’s face might be stuck in the 🙁 position. She also seems to like standing at the to of stairs. Maybe she’s insecure about her height? And no, she’s not close enough to hear what they are saying.