This is so good

...

It's actually extremely average and bland

What are those sleeve things called? Why does Japan have them but no one else?

That's not a very good example

Obi strips. Because they're the kings of packaging. Often contain extra useful info for the japs (translated or katakana tracklist, suggested price, date of release etc.), and since they're meant to be disposable, used releases with obis are much more valuable.

Also some western releases from certain labels have obi strips too (Mondo, This Heat reissues, Data Discs etc.)

this one's particularly nice imo

What is a good jazz album then?

if piano trios are your thing

It's so comfy

Youtube Jazz is free.