Checked with the MSU hockey office.  The discussion-delay did occur because
of a question about exactly when the goal was scored and the issue was
raised by the MSU bench.  The resolution was just as the box score would
indicate it should have been, i.e. the goal was scored after the first
penalty expiredX  so the goal cancelled the remaining time on the
second penalty.
  The question was raised because at the time of the goal, BG was still
2 short "on the ice" (the man with the first penalty hadn't hit the ice
yet) so it looked like it was scored with BG 2 down, but ...
  So all is well (almost).  Why it took so long to figure it out is still
a mystery to me.
  Anyway one of the issues apparently had to do with exactly when a
penalty terminates.  That is when a penalty is recorded at, say, 5:30, does it
end and 7:29, 7:30, or 7:31 and apparently no rule covers the situation
exactly (so says the hockey office; I looked quickly and could find nothing either).
 It boils down to just 'what time is it?' when the clock says 7:30?  Of course
the clock says that for nearly a full second (minus the switching time from
one second to the next).  The question then becomes what if the penalty is
recorded 5:30?  Did the player start serving the 2 minutes at the start of
the "5:30" second or at the end of the "5:30" second?  And was the goal
scored at the start of the 'second' or at the end of the'second'.  Could be
a crucial point.