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In Section 2.2 and perhaps elsewhere, appears language such as: "then queue a task to fire a simple event named change at the videoTracks attribute" More accurately, this should say "... at the VideoTrackList object referenced by the videoTracks attribute". It would be useful either to (1) spell this out in each such case, or (2) write some generic language somewhere that says "the phrase 'fire ... event ... at the X attribute' means "fire the event at the object dereferenced by the X attribute".
I think I found all the instances - let me know if I missed one. https://dvcs.w3.org/hg/html-media/rev/3ec0a2703d1a