Continuity mistake: Ray offers to rub Debra's feet instead of doing another chore. He takes her black socks off and throws them on the floor, under the table. The socks can be seen for a few shots, in the same spot, after Robert comes in. At one point, however, one of Debra's black socks can be seen on the couch in the middle, and in the next shot, the sock has been removed.
Other mistake: At the end in the kitchen there are a few camera angles that features a black object hanging into shot. This item moves perfectly with the camera and so is not part of the set or a boom mic. Perhaps something was dangling in front of the lens during filming. (00:20:45)