Quinn question
Spoiler, of course.
At the time of Quinn's fake death, she has literally just told the group about Danny. So it seems odd Quinn would've staged a death so much, to the point of posing for him to take pictures essentially, if she didn't know about him. Maybe they were aware because of stalking Sam is all I can guess.
And I feel bad for her in a way. She was probably so sexually active because she sensed her time was nigh, so enjoy it while you can