Continuity mistake: In the dance contest, Pat's shirt is tucked in at the beginning. During the "Fell In Love With a Girl" portion his shirt comes totally out. Subsequently his shirt is tucked in again.
Other mistake: In Tiffany's converted garage, Tiffany says she's thinking of putting in a ballet bar, but there's one there already right next to the big mirror, where it's supposed to be.
Character mistake: At the scene at the dinner table where Pat and Tiffany meet, the prescription drug "Trazadone" is mispronounced with a long A as in "trayzadone." This a fairly common drug used for depression and as a sleep aid. Any nurse or pharmacist could tell you the correct pronunciation. Interestingly, the other lesser known drugs were pronounced correctly.
Character mistake: Robert DeNiro says that the Eagles beat the Seahawks 27-10. In a later scene, Jennifer Lawrence comments that the Eagles beat the Seahawks 14-7. Both scores were wrong, as the Eagles beat the Seahawks 26-7 that season.
Continuity mistake: Bradley Cooper wears a necklace. While rehearsing a dance sequence with Jennifer Lawrence the necklace is alternately hanging on his chest then back, indiscriminately between cuts.
Continuity mistake: In a scene in the dance studio, Pat enters and you can see that his tennis shoes have duct tape on them. In the next shot, Tiffany is bending over, taping the same shoes that don't yet have tape on them.
Visible crew/equipment: When Pat runs towards the school, he talks with Mrs. Metgers and in the scene where they're walking up the stairs you can see a crew member with a white cap reflected in the glass of the door. (00:17:30)
Continuity mistake: When Danny is speaking with Dolores about the food she is preparing, in the first shot his lips are moving as he's speaking to her but in the second shot a moment later, they are not. (01:50:55)
Factual error: At the beginning of the film, Pat's Mother picks him up in Baltimore to return to Philly. In the scene from the car as they pass the Linc, the stadium is on the right, indicating that they are in fact traveling South on 95 towards Baltimore. Additionally, the previous scene of the city from the car could not have been shot from 95.
Factual error: As Pat's dad was driving him to the Eagles game, they pass a construction site near the stadium. The movie was based in 2008. There was no construction going on near the stadiums in 2008. The construction site in that background of the scene is from the Spectrum being torn down and the building of Xfinity! Live, which opened in April of 2012. (01:22:10)
Continuity mistake: When Pat first gets home near the beginning and is having a conversation with his parents in the hall, his father pulls out his neck chain to check he still has it, then in the subsequent shots it switches between in and out several times.
Continuity mistake: When Bradley and Jennifer arrive at the dance competition they end up holding hands. As they make their way upstairs to register, Bradley is on the left of the picture, but as the scene cuts (in real time) from them starting up the stairs to getting to the top, they have switched sides. Then, very briefly, when Jennifer goes to use the restroom, they have switched back again.
Continuity mistake: At the end of the dance competition Tiffany leaves the ball room, putting her coat on over her white outfit. She then runs through the Hotel foyer and out into the street. When she gets outside she is wearing black tights under her coat.
Other mistake: When DeNiro is discussing a bet on a future (7 weeks away) game between the Eagles and Cowboys, DeNiro points out that the Eagles are favored by 1.5 points. In fact, betting lines are not set on games until the previous week's games are played, because there may be a major injury which would affect the line. As a bookmaker, DeNiro would certainly know this. And bookmakers are rarely fans of teams, and it would be unusual for a bookie to be such a rabid fan as DeNiro is in the movie.
Factual error: The characters often wear jerseys from Philadelphia Eagles players. However, several of the jerseys are for players who were not yet on the team when the movie is set (2008).
Continuity mistake: In a group scene with Bradley Cooper's family, Jennifer Lawrence arrives and has a beer. While she's talking the camera pans the group. At one point Bradley Cooper responds. While the camera is still on Lawrence, you can see Cooper at the left of the screen. Although talking, his jaw isn't moving.
Continuity mistake: When Pat starts to read the letter from Nikki, the golden jewel is outside of his shirt, then suddenly inside. (01:19:30)
Factual error: Tiffany and Pat first meet at/around Halloween, then later in the movie she convinces Pat to participate in a dance contest with her, and they begin practices. Towards the end of the movie, Tiffany claims that Pat was with her working on their dance routine during the baseball playoff games of the Phillies, erroneously placing the baseball playoffs sometime in November or December.
Factual error: During the scene where Pat is walking around at the Eagles game, you can see the Phillies stadium in the background. The scoreboard is the new HD scoreboard that they put in before the 2011 season. When Tiffany comes to the house and is stating that every time Pat was with her, the Eagles or Phillies won. She said that the one night they were together, the Phillies beat the Tampa Bay Rays in game 4 of the world series. They played the Rays in 2008, before the new score board was put in. (01:22:30 - 01:27:50)
Factual error: In the scene where Tiffany is talking about the times her and Pat have been together she says the third time they got together and went to Llanerch Diner the Phillies beat the Rays 10-2. This happens on Halloween, despite the Phillies having their world series parade on Halloween (October 31). The actual game 4 of the World Series took place on 10/26/08. (01:27:50)
Answer: It's not exactly common, but yes, it would be up to the judge, and establishing that a person is a "clear and present danger to themselves or others" can result in involuntary commitment in Pennsylvania, where the film takes place. In this case, it would not be hard to argue that, "the person has inflicted or attempted to inflict serious bodily harm on another and that there is a reasonable probability that such conduct will be repeated" (50 PA. CONS. STAT. ANN. ยง 7301 (b) (1)), as he had just physically assaulted his wife's lover and she'd obtained a restraining order. His mental health problems would have been well-documented, so it would have been easy for a judge to order him to undergo psychiatric evaluation, which could (and, in the film, does) lead to extended involuntary commitment at the discretion of a mental health professional.