Some [questions] that I didnít even know I had ??
In other words, he gave me a lot of information. He answered all my questions, and he talked about many other things as well.
This could be sincere, as in, 'He is so knowledgeable! After he left, I realized he had talked about things I wasn't aware of before.'
or, it could be sarcastic, as in, 'He thinks he knows it all! He never stopped talking the whole evening!'
I hope this is helpful,