I reply to my own thread as I have found an answer to past-Me's question
I've made a minimal run of CB, avoiding all clues and acquiring the least possible score. Before finishing I opened the right-hand upstairs armoire and discovered the secret passage. Once I entered the screen, I left immdiately (no peeking, no other actions) This discovery alone triggers 3 scores: Upstairs hallway, Laura and Lillian's Room AND Rudy and Clarence's Room. If I'd discover the left-had secret passage, I'd just gain 2 more points, one for Henri's Room and one for Gertie and Gloria's Room.
An interesting discovery: Unless someone else knows better, I discovered it is impossible to attain zero score. Some of the score-triggering discoveries are also time advancers. For example, in Act I you have to find Henri and Fifi in order to advance the time. This alone gives you the "People romantically involved: Henri and Fifi" score. Or perhaps Fifi disappears if you enter Henri's room too late, and you can find him alone advancing the time without winning that point?
Other time advancers that trigger points are: watching Rudy and Clarence fight, Rudy and Henri fight, discover Lillian's body and discover the skeleton key in Lillian's body.
I don't know if you can advance the time (and end the game anyway) while avoiding these triggers.