The production start date of the film adaptation of \"Fifty Shades of Grey\" has been pushed back a month to Dec. 2, The Hollywood Reporter said. Jamie Dornan was cast last week in the lead role of Christian Grey after Charlie Hunnam left the project to focus on his TV show \"Sons of Anarchy.\" The entertainment industry trade newspaper said it was unclear if the film, co-starring Dakota Johnson, would still be released Aug. 1, as scheduled, now that the start of production has been postponed by a few weeks.