It apparently is the DS version. I ran into one occasion during the second case where the screen zooms out and now you see a top and bottom screen, and have to use the bottom screen as if it were the DS's "touch screen" in order to point out something. The scene functioned the same as it did in my DS copy.

Not that that really excuses anything, it looks terrible when it goes into "DS mode" because it compresses the top and bottom screen to fit onto a TV screen and it's really hard to tell what you're doing.. Fortunately this has only happened once so far, I'm still on case 3 and haven't seen it repeated yet.