The side comment from D, "Aren't you tired of this already?" in the Ruthless Night scan, is officially translated as:

TP: Is it illegal to get mail?
SS: Are you doing an Inspector Zenigata impression?

BRB, constructing an elaborate headcanon about how/why D got to be a fan of Lupin III. (I don't think he was watching this pre-canon, I think he started checking out "shows with over-enthusiastic detective characters" more recently. It was supposed to be a joke, but then, for Some Strange Reason, he couldn't bring himself to stop watching.)

D says Grandpa is in Japan searching for yamato nadeshiko flowers: "rare" in TP, "nearly extinct" in SS.

Okay, I knew from other anime that that's a "model of a traditionally-feminine Japanese woman" trope, but I think I missed that it's also a flower? Wikipedia doesn't say anything about the species being rare, though:
https://en.wikipedia.org/wiki/Dianthus_superbus

Maybe it's supposed to be a pun, and the idea is that Grandpa D is looking for a Japanese anime waifu.

D unwraps a fancy sakura-patterned kimono, Leon reacts:

TP: Just what you need...another dress.
SS: Ooh!! One of those costumes the geisha girls wear, right?!

Our politically-incorrect king.

Later, D invites Leon in for a "flower viewing", and it's the kimono. They have drinks. A mysterious band appears, playing traditional Japanese instruments. (Reportedly the kimono is dyed with mosquito blood, so...they might be mosquitos?)

Leon's reaction:

TP: When did I step into a Zeppelin album?!
SS: When'd *they* get here?

TP's pop-culture references are hit-or-miss for me. This one's a miss. I believe Leon's a Led Zeppelin fan, but no way does the Japanese mosquito band sound anything like "Stairway to Heaven" or "Whole Lotta Love" or "Immigrant Song".

I wonder if this chapter was written even earlier than it appeared in the original collected editions. There's no mention of Chris, not even an excuse of "it's late, he's already asleep, that's why he's not joining us for the flower viewing."

Anyway, Leon has some weird trippy flower visions, then wakes up. D says he must've had too much sake. That's right, this was the "Leon gets drunk and sleeps with D" bonus.

...From this point on, the actual chapters start getting re-ordered.

In TP, volume 8 plus most of volume 9 includes:
(8.1) Deep
(8.2) Dummy
(8.3) Deja Vu
(8.4) Flowers, the Detective, and the Detective's Little Brother
(9.1) Duel
(9.2) Durableness
(9.3) Desperation

In SS, the end of volume 5 plus all of volume 6 includes:
(5.30) Dummy
(6.31) Deep
(6.32) Deja Vu
(6.33) Flowers, a Detective, and a Brother
(6.34) Duel
(6.35) Desperation

So the order of "Deep" and "Dummy" got swapped. Possibly just for page-count reasons? "Deep" is somewhat longer than "Dummy"...but no, I'm looking at the page counts on the SS website. V5 and V6 are tied for shortest, at 280 pages each. V3 is currently the longest at 312, and the upcoming V7 will be 336. There was room for the rest of "Deep" at the end of V5.

And then "Durableness" is missing. If it's at the start of V7 (which isn't out until August), that would mean "Durableness" and "Desperation" also got swapped. ("Desperation" is *slightly* longer, but not by much at all.)

Weird choices.

(Complicating things even more, the chapter list TP V9 has on the back cover is just flat-out wrong. I'll double-check when I get there if the summaries still match, but the titles don't, at all.)