The actual making of Bitcoin is for Satoshi to tell because it's his/her/their creation, but since he/she/they aren't around anymore, who will tell the story?
I think they will get those info on what so called expert on history of Bitcoin, but I don't think that they can point out the real situation happen since the real Satoshi is not around. Maybe what we can see is just made up stories to sensualized the movie and make it appealing to their audiences.
I guess the most that could be done is a sort of a documentary featuring those who corresponded with Satoshi before the release of the whitepaper in 2008 and the launching early in 2009. Even this could only shed a little light as to how Satoshi really worked on Bitcoin.
If they can interview those people those people working with Satoshi on early days of Bitcoin then this will make the documentary became more interesting.
If there's such a movie, much of it is probably filled by mere assumptions and imaginations of the creators.
Yeah the movie will provably like that and it will add up another speculation that will raise up more curiosity about the real identity of Satoshi.