Well, I wasn't expecting it to exactly reference the differences,
but just a cursory glance at the info provided, it appears that
maybe it could be a combination of negotiating the 6/4 / 4/4
signatures that begins the work with orchestral balance.
...or maybe not...
BTW: there's a specific mention of the Hanson version
and a graphic of the temporal length of each section on
pages 18 and 19.
Anyway, it could be like any other poor performance:
attention to details or misinterpretations.