Okay so- These were a lil tricky but:
Jed's second ending - MUST sleep with Jak first, then Magnolia for it to trigger.
Jak vs. Dijon fifth ending - Interact with Will first, then try to trigger Bastard. Once you get his scene, make sure to click on the "call out" option
Jak vs. Dijon sixth ending - Same process as the fifth, except make sure Jak was the first person you interact with in instead of Will!
Hope this helps in some way!