Im pretty sure you just have to get the gifts for sam for the love points, one of them is a textbook on a seat outside of the toilets, but im afraid I don't know where the other is sorry.
Edit: there isn't a second gift for Sam according to the dev unless you wait for an update or subscribe to the patreon
For the misty scene, you have to grab the kaycard from the security office (it's on the desk next to the little case) and then take it to the door on the left in in long hallway with the key card slot. A dialogue scene will play and that's the misty scene.
About jeane, I'm not at that point yet so could you tell me how to get there please? I'll try to figure out from there if you could help.