One erotic scene called for a close-up shot of Johnson's naked butt, but the 26-year-old actress apparently has a tattoo on her rear which wouldn't work for her sexually innocent character, Anastasia Steele.
"I wouldn't say it was one of the highlights of my career, but it certainly was one of the most surreal scenarios," McGavey added.
Johnson wasn't the only one who needed some tasteful coverage, either. According to McGarvey, "Jamie [Dornan] had a cover over his penis," which must have been difficult to hide in post-production as well.
With the film's sequel, Fifty Shades Darker, kicking up production, maybe they'll save themselves the time of finding a body double for Johnson and just write in a scene where Anastasia gets a tattoo on her butt.