The exact information for a bunch of these should already be in the thread, but you'd have to search for it.
Now. For the car one, I think everyone knows how it works. Piss of L, he fucks Kana in the car, but that happens ONLY if there's an H-event in the last time-slot that you can intervene in. If there's nothing, or if you stop that event, he doesn't get Kana in the car.
For the exposure event. First, the sex-toy shop has to be open. Not the porn shop, the sex-toy shop. After that, once it's up, there's a random chance that an alley event in the last time-slot, and it has to be specifically an alley event and specifically in the last time slot... will turn into L taking Kana to the store for the exposure thing. Below 800 submission you get the 1st event. Over 800 submission, you get the second one... though it's technically tied to body development in some way or another. Don't remember the details.
For the two underwear AVs... I honestly never figured out the conditions of what triggers one over the other. I THINK it might be related to atmosphere or submission score or some combination of both... But I honestly don't know. I remember way back that I was able to trigger the one with the swimsuit that had vaginal penetration, but not the one that had anal, while for the lingerie thing, I got both without issues. Been too lazy to look up the exact conditions for them.