Yes, they are pretty good.
Usually the subtitle set is the give-away.
US made TV series often have English French Spanish as spoken (perhaps two English audio versions), and English, English for the Hearing Impaired, Spanish and French as subtitle choices.
Far Eastern versions often have various Far Eastern choices, plus Portuguese.
South American versions always have Portuguese in addition to Spanish, but the Far Eastern choices might be missing.
All are NTSC, Region One of course.
Even Amazon Direct sent me the Far Eastern version of a later series from Gossip Girl …
Then there are the US and the Canadian versions, often on the same page, especially if the film or TV series is Canadian, like La Femme Nikita.
On the other hand, there are various US versions, often the cheaper retail releases were made for Walmart and / or Costco!
I have Mad Men full retail version, and the Costco version, they look and feel different next to each other. The Costco version is thinner, and the discs come in a different kind of jewel case, not the fold-in type, but the one with multiple thin plastic holders inside the plastic box.