There's a interesting set of quotes here
this quote was especially apropos
“To a screenwriter, that might seem kind of awesome. For once, the director can’t change things. But when its your own movie, it’s maddening. J.J. was describing a scene he was shooting the day before. Midway through it, he got a great idea for a new line. Which he couldn’t write. Couldn’t shoot. Couldn’t be in his movie."I like to imagine that many of the cringeworthy plot holes were left unplugged for this very reason.
There is no improvisation allowed during a strike?