Some character names have surfaced today:
Christina Ricci/Ellie Hudson
Skeet Ulrich/Vince Winston
Jesse Eisenberg/Jimmy Myers
Milo Ventimiglia/Bo
Kristina Anapau/Brooke
Scott Baio/himself
Corey Feldman/himself
Mandy Moore/herself
Also, the reshoot of the third act will hopefully take place in September.
Source: Z Review
