There's an episode where he's talking with Connie about their book series over the phone. Then he says he's sorta confused about various plot points and doesn't really understand them given what happened in other books he read.
Connie: “Wait, you haven't read this other part? How did you even find out about that? Steven, what order were you reading these in!?”
Steven: “Uhhh... alphabetical?”
Connie: “STEVEN! Hold on! I'll be right over.”