To make Jennifer Aniston look more worn down, director Miguel Arteta had her wear wrist weights for several weeks before filming, and she wore them in some scenes as well.
Jake Gyllenhaal admitted that his main job in the film's sex scenes was to lie on top of Jennifer Aniston and keep her breasts covered. He said he also placed a pillow between them so he would not touch her lower areas.
Jennifer Aniston trusted director Miguel Arteta to stop her the moment she did anything resembling her role on Friends (1994). She would jokingly tell him: "Please don't let her be Rachel."