last year the epp for bill and teds was valid for the first show only.
i got skunked on that one.
but i sweet talked the guy checking tickets and he did let me in the second show. i wouldn't count on getting lucky again though. each year hhn grows with more crowds.
i read on another site that you can pay additional amount and be able to do ioa from 4 to 7:00 and then go over to the studios for hhn.
i think if you have the hhn ticket for that night, you can buy the ticket, thinking it is $10???, and do ioa for 3 hours than venture over for hhn in the other park.
this helps those that only have the hhn ticket but still want to do some rides at ioa.