First scene - I enjoyed how they portrayed the captain-general as frail and useless - not because I particularly hated his character, but it's important to drive home that the pilots were the useful ones (who navigated). I'm not going to lie, I thought they were going to nerf Blackthorne, but so far, so good. Also enjoyed the second scene with the landing - Blackthorne still making an effort to struggle against their captors.
The scenes illustrating the captive status of Toranaga and introduction to the politics are well done. The pit scene portrayed Blackthorne accurately according to the book - smart and brave but with his share of foibles such as his pride and sense of decency. Omi was portrayed well too - yes, he did piss on Blackthorne in the book. The Portugese priest was great - his weeaboo grasp of Japanese is exquisite. Yabu's disgust with him is also exquisite.
I think their casting choice for Toranaga is excellent - warmth one moment, and detached civility the next. Oh shit, here comes the boiling scene. They better have Yabu's apology/confession later on. Now there's something I don't remember from the books going on with the courtesan and Yabu. I'm not a fan of the humor (HURR DURR NAKED, HURR DURR SHE SLAPS HIM AWAY), but it's tolerable. Great that they kept Yabu's treacherous nature (omitting the discovery of the ship by not telling Toranaga). The actor for Blackthorne is growing on me.
RODRIGUES! God I like this actor for him too! Business-like, jovial, and with an edge. The ship scene -


And the same about Yabu starting to row (reminds me of the attack scene from "The Hunt for Red October" - "Get that thing off my ship!" "It's off!" except this is nonverbal from Yabu). The cliff scene was very, very good.
The Mariko scenes were good with explaining her past (at least, to a certain degree - don't want to give away the whole game though) and the mentality of Toranaga and his vassal lords. Really enjoyed the ending montage with the voiceover. I failed in my quest to get an audiobook version of the book, so I haven't read it or heard it in years, but I think it's extremely close to the book.