Well, nobody claims the Hollywood movies are 100% accurate... I laughed a lot when I saw the movie Taking Lives with Angelina Jolie.. the beautiful city you see at the beginning of the movie claimed to be Montréal isn't Montréal, it's Québec City, 300 KM from Montréal :p
But a biographic movie based on a book and with the help of the widow and daugther of the man himself, please, I don't think it will be filled with inacurate facts...
I can understand that sometimes you have to make choices to have a "movie" though, but they have the best person to judge in Debbie Curtis, so I'm confident... now I just hope they'll ask the boys to be musical advisers...