Some mild noise reduction was applied by Criterion to the audio track on their blu-ray, while the track on the Czech National Film Archive disc remains retains more high-frequency detail.
The Czech track requires a +22022 ms delay to sync to the Criterion disc. It's also missing one frame in the middle of the frame (big deal!).
As an aside, a handful of shots (not scenes) have had their luminance levels adjusted on the Czech disc, oddly, and some amount of fine shadow detail has been lost. Also, video compression isn't necessarily better on the Czech blu-ray despite its higher bitrate.
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