From watching so many behind the scenes and making of bits over the years its clear films aren't always clear cut even to those making them at the time, sometimes people think they are onto a winner and it turns out crap, and others the complete opposite, thinking it will be a dud, but thanks to a combination of things it turns out great.
From the actors point of view on set I guess they only see daily footage at the time, and the script but not the full package, i.e Special effects, editing and of course music which make the whole package and how its presented on screen at the end, but some must have an instinct its going to be bad especially if like this film it was a troubled shoot from the get go.
I guess the professional ones just get on with it and don't throw a tantrum.

Oh for sure, how very true.
Nothing is as it seems, nothing is just one thing and nothing is ever just over there;