Exactly SageSmile
I see it as being a similar opening scenario as Call of the Dead ... filming away, when suddenly they and their team get ambushed by the zombies.
Only thing is is when is it set?
This is a tricky one. However i believe it is set in the same time frame as GREEN RUN and NOT in the Prohibition era like everyone thinks.
The 4 characters ALL play mafia/gangsters, they are filming a 1930s style film yet they are not in the 1930s!
As to the colour of the eyes, my guess is Maxis takes over. Seen as Sams zombie eyes were orange, Richtofens were Blue ... it seems only logical that the only person left that can control them is Maxis. (Seen as Sam is not in control, and Richtofen's only rival is Maxis).
Again just thoughts and ideas but it makes sense ... no?