I was there yesterday and the Lakers were NOT there. It was a rumor started by some CM's because apparently Kobe had gone there after their last championship win the day after the parade downtown, so they were trying to figure out what the code was that was sent to several higher ups and "assumed" it was due to the Lakers or Kobe. Both proved to be wrong.
The reason for the crowds was that So. Cal (not the cheapest, but the 2nd level) were not blacked out on Monday or Tuesday but are blacked out until next Monday - Wednesday. Add the World of Color into the mix, and you ended up with huge crowds; none of which were related to the Lakers.