Flashback: There are multiple flashbacks to Adele's life as a teenager when she was dating David and friends with Rob.
In the present, she has a straight chin-length bob to reflect her new personality and the fact that she isn't Adele anymore.
Expository Hairstyle Change: In the past, Adele had long, flowing, wavy hair.
Dream Walker: Adele and Rob are able to enter each other's dreams.
They appear to be asleep, but their souls are not in their bodies.
Dream Spying: Both Adele and Rob are revealed to be able to astral project themselves to spaces they have visited and spy on people.
Rob is able to control his dreams in the same way. Later, she begins to have more pleasant dreams, some featuring David. Louise suffers from night terrors, often featuring her son in danger.
Dream Sequence: The story features multiple dream sequences.
Dream Emergency Exit: Louise begins to train herself to control her dreams using Rob's journal, including methods to exit the dream.
If David hadn't been attracted to her, and she hadn't entered a sexual relationship with him, she wouldn't have been essentially killed and replaced by Rob.
Downer Ending: Rob wins again, killing Louise and taking over her life just as he did with Adele.
It's never implied that he's evil because he's a homosexual but he is definitely depraved and evil.
Dark Secret: Both David and Adele are keeping dark secrets.
The Cutie: Adam is a pretty adorable, normal kid who loves both his parents and wants his mum to be happy.
Conveniently Interrupted Document: Rob's journal has multiple pages torn out at the end.
Control Freak: Louise finds the way David controls Adele to be sinister.
Brooding Boy, Gentle Girl: Moody, tormented David is very attracted to upbeat Louise.
BEHIND HER EYES HOW TO
Body Surf: Rob figures out how to jump from Adele body to Louise's body.
Body Snatcher: Rob stole Adele's body and life.
Big Fancy House: Adele grew up on a large estate including paintings of her ancestors.
Big Bad Friend: Rob is this to Adele they were best friends in the psychiatric hospital, but he stole her body so he could have David to himself.
Best Friend: In the present, Adele thinks of Louise as this.
Batman Gambit: Rob!Adele's plan depends on Louise being a good person and wanting to save Adele despite everything.
The Bad Guy Wins: We don't know until the final episodes who the bad guy is, but Rob is and he wins.