When Veronica is boasting about having a portal in every room, enabling them to plug in an iPod and play music in every room, she questions everyone saying, "Who doesn't have an iPod?" As she says this, Pat's voice can be heard saying, "Well, I don't have an iPod. I don't even have a phone." Seconds later when she has finished asking the question, Pat says it again.
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.
When Pat first goes to his therapist's 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...
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.
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.
On Halloween night, Tiffany starts screaming when she and Pat are arguing in the street. The cop stops to see what the commotion is and then Tiffany leaves while Pat is still talking to the cop. Up to that point, Tiffany's hair was parted on the side in front and pinned up in back. When Pat catches up with her, her hair is now parted in the middle and mostly down in the back.
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 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 no ice inside. In the next shot the glass is full with ice.
When Pat and Tiffany leave Ronnie and Veronica's house, Pat is wearing his jersey. As they walk home you can see the #10 on the jersey, but when they turn the corner, Pat is instantly wearing a jacket he didn't have on an instant ago, and was never even carrying.
When, while jogging, Tiffany convinces Pat to enter the dance competition, there are two magically disappearing and reappearing cars. At the opening of the scene at approximately 55:46, just after Tiffany overtakes Pat, there is a house with two cars in the driveway. The cars are: a black 2006 Mazda 6 and a burgundy 2009 Honda Civic. At 57:21 the cars are clearly not in the background. in the space of seconds, at approximately 57:30, the cars are back.
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 Tiffany tells Pat Sr. the scores of the Eagles and Phillies games, she says the Eagles beat the Falcons 27-10, and the Phillies beat Tampa Bay 10-2, which is true. But both games took place on October 26th. It was Halloween on that day in the movie, which was actually on Friday in 2008. The Phillies had already won the World Series. Halloween was the day of their parade.
The Eagles/Giants game (which the Eagles lost 36-31) that was so important to their season according to Pat Sr. was during week 10. The Eagles had 7 games left to play before the end of the season. Also that game was a night game, which means the scene in which Pat comes home with his brother, and Tiffany comes to the house would have taken place around 1:00 a.m. since the game was over.
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.