There are frames missing in the Perfect Blue UHD when the photographer is stabbed repeatedly. The screen goes black during those parts. This also happens on the Japanese UHD. Video comparison with Blu-ray (slowed down to 6fps for easier viewing)
This happens again a few seconds later, but I'm not showing it here because of exposed breasts and pubes. Because these shots are repeated, the missing frames can be replaced easily. I hope that this can be fixed in the standard edition.
There's another error early in the film that I noticed that should not be difficult to paint out:
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