OK, so in terms of interesting:
1. Slow Grandpa
2. Playboy Glasses.
3. Literally nothing.
4. Main protagonist.
Reason for this is because we're actually seeing character development with the first two. SG was a bullied victim, but now he's given this authority and power that's slowly molding him into a more assertive man. Yet there's this uneasiness of him potentially becoming morally corrupt with said A&P and possibly abusing it morally in some ways. Meanwhile, PG was a content average dude but now there seems to be this foreshadowing that he's gonna become a bigger sexual degenerate (like how porn addicts go from vanilla to fucked-up fetishes and kinks).
Contrast with those two, fucking the main protagonist has been predictable and completely one-dimensional this whole series so far. It's fucking irritating.