I think I'll give Hollywood the benefit of the doubt here. Maybe -- just maybe they didn't want to show up en masse because it would have detracted from the solemnity of the funeral. Or if they did show up, there must have been a mutual agreement by the media and live video crews not to shine the spotlight on them. I think Arnie was there as a government official. It's also possible that many actors/actresses and show biz people went through the line disguised and unrecognized, sans coteries.
And it is just possible that Hollywood thought it best to have their own private and unheralded memorial for Ron, as co-workers might do. I can understand that.
If I'm wrong, I'm going to be more than just a little dis-appointed.
Yes, I am sure that is the situation!!! /sarcasm!!!!!