Board Thread:Episode Discussion/@comment-34633327-20171118002715/@comment-10390252-20171119210801

My guess is that he technically knows all of them but it will take an associative trigger for him to access the knowledge. If he's present when Yang and Weiss start babbling about all of the 'nonsense' (Weiss's likely description) that Raven said, I think that Oscar will suddenly 'remember' a lot of things, not all of them particularly nice.