driving to the forum from glendale was not difficult, and i did it for twenty plus years. the best part was there were small crowds, but even on sellouts it was never terrible until you got to within a block or two of the forum.
it'll be a lot different having 70,000 football fans driving to hollywood park. the good news is that the 405 is close at hand, and it's a short drive to the 110 or the 105.