As Pat Jr is being driven to Lincoln Financial Field by Pat Sr before a 2008 Eagles/Giants game, a few quick shots of the crowd entering the parking lot and stadium are shown. One fan is shown from the back wearing a green, Asomugha #24 jersey which wouldn't have been made until 2011, when free agent Nnamdi Asomugha signed with the Eagles.
When Pat and Tiffany are discussing Nikki's reply letter in Tiffany's apartment, Pat's necklace medallion changes position several times. It alternates from under his collar, over it and then on the back of his collar when he walks away from her.
There are two Cadillacs at the house, an older black one and a newer silver one. When Pat's dad is driving him to the football game, an exterior shot shows them in the newer silver one. When they are shown talking inside the car they are in the older black one.
Upon meeting Pat for the first time after he comes home, various characters comment on how he's lost a lot of weight. However, the old photograph of him in his parents' home shows him looking the same way like he does throughout the movie, only clean shaved.
During one of the Eagles games early in the movie, it is said the Eagles are beating the Seahawks 27-10. Later in the movie as Jennifer Lawrence is reciting all of the good results since she and Bradley Cooper have been together, she mentions the Eagles beat the Seahawks 14-7. The Eagles actually won that game 26-7.
When Tiffany goes to the bar at the dancing contest she asks the bartender for a vodka, she brings the glass to her mouth but you can see that there is not ice inside. In the next shot the glass is full with ice.
When Pat first goes to his therapists office and freaks out about the music playing he looks for speakers behind the magazine rack, but when the therapist comes out there are two in-ceiling speakers sitting on the reception desk that weren't there when he came in and we never see him remove them...
At Veronica's dinner you see in the door behind Veronica the reflection of Pat. He's sitting backwards with his arms crossed. When the camera turns to Pat, he's sitting forward with fork and knife in his hands.
When Tiffany runs out of the Llanerch Diner and Pat chases after her, the scene changes to what appears to be the town of Lansdowne, PA, 2 1/2 miles from the diner. There is no "downtown" area around that diner.
On the night after the Giants game, the characters argue about betting on the final game of the season against the Cowboys. One of the characters mentions that the point spread is one-and-a-half, although this takes place seven weeks before the Cowboys game and there would be no point spread yet.
When everyone is at the football game and they are all enjoying the game and celebrating, they are jumping up and down. In this process they are holding cups, so even with the slightest bit of liquid would spill everywhere, revealing that there is no drinks in the cups.
When Pat goes to see his psychiatrist for the first time and recounts what happens with his wife and it flashbacks to the "incident" when Pat is walking up the stairs and hears his wedding song. He sees underwear, and pieces of clothing and he says he looks at the DVD player and it's playing a CD. When actually the song is playing on a CD player not a DVD player.