I think part of the discussion comes from the communication about Arrow's care to get the proper frame rate and the proper sound pitch and yet, there's a pitch difference between the set and the OST CDs.
As Moshrom righly points out, not detecting the issue also doesn't mean it isn't there in the first place. It might not be bothering (see below) but it's there.
Moshrom wrote:Again, it's equivalent to PAL speed-up, which is well-established as being something that even untrained, non-musicians can notice.
I challenge that assertion. I doubt anybody watching for the first time a movie with a PAL Speed up could detect the issue if it wasn't for already having some reference (an opening logo cue, a canon classical piece, the voice of an actor or an actress).
I've watched lots of movies that turned out to be incorrectly encoded in 1080i50 instead of 1080p24 and I usually couldn't detect it. I'll probably ear the difference on the French BD of Z, because I'm very familiar with it through the Criterion DVD, but when I saw What We Do In The Shadows or Starred Up for the first time ? Absolutely no clue they were in 1080i and I would have no idea if they were pitch corrected or not (which is another variable).
However, I was able to easily detect this stuff on the French The Brood and Scanners BD because the opening Pathé logo was higher pitched, but that's only because I've had watched so many Pathé BDs in 1080p the previous weeks that my memory had a fresh A/B comparison.
While I don't doubt many people could easily notice a pitch difference during an AB comparison, I thus doubt they could find out from a brand new sample that it's improperly pitched. It's, after all, not much different from all the recent discussions over color-timing of new restorations : while some are so weird it's relatively easy to notice the change, many discussions only started (and kept on) because of / thanks to the availability of AB comparisons and / or lots of prior knowledge. Without these, I think many differences would have been unnoticed.