It wouldn't have been unusual for the script to have been revised at some point, or for the final product to deviate even from that, so it would be interesting to see the original screenplay written in 1979 and verify some of this
A quick google tells me the screenplay definition changed over the years following its original writing, but I'll be damned if I know where to get a copy of the original, if that's even possible. People claim to have read it, at least!