I am constantly amazed by how people just skip over the actual Atonement in the Garden of Gethsemane. They showed zero of that part of his life. The most important couple hours of Jesus' life didn't even merit 5 minutes in the movie?
Some other inaccuracies from the Biblical account that I noted were the tomb scene when Mary and the Apostles return to find Him gone, but I chalked that up to trying to save time in the movie rather than a lack of understanding like the Garden part.