I guess you're right that that's the only place where that piece of info is really divulged. I try not to spell things out for readers so I just know their history in my head and try to let it naturally come out on its own. Sometimes that's bad, like how earlier versions let it slip too soon about Dallas having a "history" with Robin, so the beta readers were like "WHY ARE WE NOT TALKING ABOUT THIS?" xD
The memorabilia has been a thorn in my side for a while. While releasing new versions of the game, I tweaked the unlocking code and such for characters, so their unlocked state was re-locked for people who played before the updates. Maybe that's what you're referring to? If not, please let me know which chars/scenes are not unlocking for you.