6. Quinn is hung up on Debra and isn't that into Jamie. How many hints does Batista's little sister need? Now Quinn is beating up cops at a
bar restaurant to defend his ex-gf's honor while he's on a date with Jamie. And to us viewers his feelings are even more obvious when he tells Debra "things are so easy with you, with Jamie things keep getting tripped up." As if things are not getting tripped up because of his longing for his ex-girlfriend.
7. Dexter has emotions (if muted). There was a lot of back and forth on this between Dexter and Dr. "Trust me you're dead inside" Vogel. Dex discovers when Yates uses his dying father as a distraction to escape getting caught that he could never use a family member in such a fashion and therefore Vogel is wrong about him. Granted, Dexter is setting the bar pretty low for himself, but we're siding with him anyway -- Dexter knows his feelings and seems pretty certain about them. Yet when it comes to Debra, the doctor might be right that---
8. Debra will always choose Dexter. After being haunted by the idea that she should have shot Dexter last season, Vogel helps her realize that she would still make the same choice today. She learns this in a pretty dramatic fashion after Dexter admits during their drive that their father killed himself due to guilt over Dex's slayings. She turns into a literal Dark Passenger for Dexter by grabbing the wheel driving the car into a lake (the crash was pretty great). Debra is rescued by a fisherman, then goes back and pulls out an unconscious Dexter rather than letting him die. (I'm pretty sure it's not a spoiler to reveal that Dexter didn't just die here in the fourth episode of the final season).
Bonus! Set-visit factoids: "It's sort of the last straw," Jennifer Carpenter explained to EW on the set about why she drives the car into the lake. "It's yet one more person she cared about [who died because of Dexter]. Sometimes you can't calculate something, it's a visceral response. At her core, she loves him, at her core, she needs him ... if you're brave enough to love all-out in your life, there are people that are clearly not healthy choices for you that your body your heart you will [go] to them again and again."
The Dexter team actually shot a scene that directly follows their reemergence from the water (it's not part of next week's episode) showing Debra dragging Dexter back to the shore and giving him mouth-to-mouth to revive him. Surprised it wasn't included since it gives a believable and non-romantic excuse to show Deb and Dex locking lips. But the image of the Morgans being "re-born" out of the water is pretty strong too.
Questions for next week: Will Dexter cancel the cable guy? Will he be able to forgive his sister for trying to kill him? Will the Morgans ditch Dr. Vogel? Will Quinn get promoted? Will Matsuka stop hitting on his daughter?