For me, Cal had noticed Johnny's feelings but couldn't reciprocate it at the time. He can't just be doing all that for money. Even if he's not the scammer, he still puts himself at risk because, as the bad guy said, he looks almost identical. They can just arrest or execute him to close the case. Also, we've been reading Johnny's mind. He said himself he's not the scammer. If he lied that means he broke the fourth wall which I doubt.

Maybe I’m just stupid and can’t catch on or don’t remember but what did Johnny mean by saying “so you knew” or something like that. And Callahan saying it was obvious, therefore the background check etc etc. im confused as to what their talking about and what was found out