When Brooke is supposed to appear nude, before she enters the
room where Gary is, you can see her bra. Something similar happens when Marilyn Dean is painting a nude of a guy. At one point you can see the guy's underwear.
When Brooke is on the phone after her dinner-party, she picks up a martini glass full of fruit off the counter, empties the fruit into the garbage then places the glass in the sink. In subsequent views of the counter, the glass reappears and disappears.
When Gary walks into the apartment with the grocery bag (before the dinner party) the bag starts out standing up on the butcher block. In the next shot it's folded up and the mixer's missing, then the next shot it's folded up, laying down on the other side of the mixer.
While Gary is playing the Madden video game, the ABC Monday Night Football theme song is heard. That song has never been used on any versions of Madden on any of the video game platforms.
When Gary goes to the bar to talk with his friend about his relationship problems, his beer changes position numerous times.
After Richard beats up Gary, and Gary is lying on the floor, there is blood to the side of his nose, not coming out of it.
The art piece that Brooke shows Carson near the end of the film is hung crooked in relation to the molding on the wall.
At one point while Gary is playing video games, he pauses and the XBOX sound is heard, however he is clearly playing Playstation 2.
When Gary plays Grand Theft Auto, his character is throwing Molotov Cocktails, but it is making the Grand Theft Auto rocket launcher sound.
At the end of the movie, right in the second when they say each other good bye on the street, in the background appears for a split of the sec a guy who walk by and later in the scene a the same guy is waking again from that direction with a brown bag, right when the credits starts.
In three separate scenes the boom mic is visible, most noticeably in the scene at the counter of the art gallery between Brooke and Carson while he asks her out with Christopher looking on.