For one, the main audio track, a 5.1 English track, is not lossless, which you just... don't see on blu-ray. It's a 768kbps DTS track, not DTS-HD MA. Now, this isn't bad at all (768kbps for 5.1ch works out to about 128kbps per channel which is pretty damn good), but of all the movies to not include a lossless soundtrack, The Blues Brothers? Nearly half of that movie is musical numbers! And there's no good reason I can find for it. Fitting onto a single-layer disc? Nope, it's a dual-layer 50GB disc, and the movie as it takes up about 22GB of it. They simply didn't want to use DTS_HD MA for whatever reason? Well, then why does the Making Of documentary on the same disc, a standard definition special feature, have its audio in DTS-HD MA? It makes zero sense to me, I have to assume this is just down to negligence, incompetence, or a mix of both (I really doubt they had a truly lossless audio source for that SD Making Of doc...)
Another thing, I really cannot stand not having original audio options. It annoys me enough when people like Paramount only give me 7.1ch remixes of Star Trek movies from the 70s, but a movie all about the music really should have had an option for original theatrical audio - even if it was also lossy, for whatever reason. Apparently you can still hear the last remaining vestiges of the original audio mix if you switch to the French 2.0 track, but, y'know, then the movie's in French.
Beyond that, there were some... bizarre special features. It seems to be a pretty early blu-ray (the disc date says 2011 according to MakeMKV), and the menu includes several tutorials on how to use a blu-ray player - including, no shit, an entire step-by-step instruction guide on how to operate a PS3 controller. This isn't even a disc from Sony, it's a Universal blu-ray, but I guess at the time everyone knew that the large majority of blu-ray players would probably be PS3's, and newly acquired ones at that.
There were entire videos describing the functionality of BD-Live and Pocket Blu, both of which I've ripped and fully intend to upload whenever Cohost adds video uploading someday, for the hell of it. And lastly, there was... well, I can't explain it. I'll just have to show you.