The other easter eggs are only images on cams, but don't give you sex scenes except for the donut one. The only other one I know, is the golden freddy easter egg. You have to go on cam 3 (closet) repeatedly, until the poster on the wall changes to have golden freddy's face on it. Clcik on the poster. After that, she'll pop up on your desk, and all you have to do is let her jumpscare you.
Sometimes it happens randomly, Golden freddy appears on your desk even if you haven't clicked on the poster on cam 3. If you want to get rid of her, just quickly go to cam three again, before she jumpscares you, and she'll be gone.
(Can't help with night 6, because I haven't gotten that far yet, sorry)