Don’t confuse a “plot hole” with a “twist”.
Wikipedia defines a plot hole as "illogical or impossible events, and statements or events that contradict earlier events in the storyline", so I'd advise you not to confuse plot holes with a story direction you personally don't prefer.
Does Luke drinking milk from the ball sack tits of some alien sea cow add to the “meat” of the movie?
No of course not. That was humor, and tastes will vary. Personally I found Yoda's behavior in Empire Strikes Back far more cringe worthy, even when it was explained away as 'testing' Luke.
As for twists, I had in mind things like Kylo betraying Snoke even while he was reading his mind which was clever, the mind bridging being a ploy of Snoke all along, the fact that even though Kylo liked Rey he wasn't going to turn good, he just wanted more power for himself, the way Luke went out at the end being far more meaningful than a stereotypical lightsaber fight, and things like that. I also liked how Snoke told Kylo to 'take that ridiculous thing off' (his helmet) and called him a child in a mask. I took that as a well deserved dig at Abrahm's The Force Awakens, who was trying to make Kylo a bad ass Vader knock off. Episode VII deserved to be subverted and Episode VIII did it, and well IMO.