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The definition of comments in http://dev.w3.org/html5/webvtt/#comments is not correct. Comments should be preceded by a blank line otherwise the "NOTE" line will be part of the previous cue text (or header). The examples are correct.
I believe the word "blocks" was meant to imply that. But it is not sufficiently defined. Fixed in: https://dvcs.w3.org/hg/text-tracks/rev/c29058680fd2