Factual error: Mohegan Sun casino is in the state of Connecticut. Connecticut does not have legalized sports betting and did not have it in 2012, when the film is set, therefore Julia would not have been able to place Howard's bet.
Revealing mistake: "Prince Ali" descends on a magic carpet surrounded by fireworks...in a hall that is roughly 20 feet high. The scene is played 'straight' and not as parody. (00:39:10)
Continuity mistake: Mario was chewing a mouthful, then lifted his drink to wash down the food, but when the camera shifted, he was back to chewing a mouthful. (00:01:59)
Continuity mistake: The location and intensity of Lavinia's purple hair highlights vary throughout the movie. For example, the purple highlights on the right side were far more pronounced (two wide, distinct, vivid lines) when she got home compared to when she first met Ward. Lavinia rode her horse Comet home, so her hair would have been wind-blown and the highlights would not have been likely to be neatly straight down, especially since she has long curly hair. (00:05:10 - 00:07:13)
Visible crew/equipment: When Erick asks Sam what she's reading, the shadow of the camera can be seen on the wall next to him. (01:27:51)
Other mistake: Judy is singing on stage with some showgirls. She is singing into a wired microphone. At the end of the song she twirls around twice, but the microphone does not appear to get wrapped around her. (00:49:35)
Continuity mistake: Catherine is in Brittany's flat and she sits down telling a bit about her past. Seen from behind she is touching the hair on the right side of her face, instantly turned into the left side at the cut. (00:16:25)
Continuity mistake: At the beginning of Aiai Liu's flashback, she is on a boat. Fellow prostitute Ping leans forward towards Hua saying he should treat them all fairly. Aiai she is intently cleaning a fingernail in one shot, immediately after she has the same hand placed on her cheek. (00:32:45)
Continuity mistake: Second part of the conversation when Emma right away spills the 'secret' to Lissy; forgetting the fact that they both have refills for their drink (we just assume they had one off-camera not shown), the wine in Lissy's glass changes level from shot to shot several times (for instance when she listens to Emma once she answered about the dead guy it empties in mid-air, or when she suggests to "do it at work", the glass is refilled in the reverse shot). (00:23:50)
Factual error: Towards the end of the movie when Superman and Henshaw are fighting on the Watch Tower in space, Lois hits the sun shades to lower them so that direct sunlight can hit Superman and power him up. This is out in space with no atmosphere to filter the sunlight. The reason the blockers were there was for this reason, to keep the harmful unfiltered sun light from hitting people on the ship through the windows. However, she is able to stand there in the direct light after it's done and kiss and hold Superman without being hurt or burned by the intense direct unfiltered sunlight or its radiation.
Continuity mistake: Gabriela's luggage crashes down the slope into the vehicle of the beefy co-protagonist. During the scene, the bra on the pickup's hood is positioned in an obvious different way (also coming lower onto the fender's arc) between shots. (00:13:00)
Other mistake: The opening (like most of the movie) does not make much sense, so you can pick your kind of mistake here; the special effects are cartoonishly bad throughout the big firework explosions. When John Abraham is knocked through a window by a rocket (which takes off with a 270° turn without even rising) to the face, he gets up unscathed and starts screaming for Junky and Chandu. The camera moves from them to him and he's running with the girl in the red costume in front of him (which was way behind, safely, when he crashed through the window, so already that is wrong), and then there's a wider shot. In that shot, you can tell that Adams is bumping into the same people as before and the distances between the extras are all wrong. (00:06:35)
Continuity mistake: When we see Christmas Flint with her dad and Miss Rayleen for the first time, she's watching them bicker, her chin perched on the back of her hand. Which hand, though? It's her left hand for the greater part of the scene, but in the shot when Jim Gaffigan is saying "I got to find my pants. You move my pants?" it's the right one. (00:05:00)
Continuity mistake: When Santa tells Noelle he's anxious about inheriting his dad's role, the position of his arms is inconsistent between front and side shots.
Plot hole: SPOILER ALERT! During the final fight, Joey kills Frank and she reverts back to human form. Abigail tells her she's fine, because Frank was the one who turned her. However, when Frank kills Lambert he does not revert back to human form, even though Lambert was the one who turned him.
Visible crew/equipment: When Shen is telling the crew to look at the data on the disk, there is a shot of Hush turning his face to look at his computer screen. In his glasses, there is a large, glaring reflection of a green screen in them. And it's not the computer screen. (00:16:09)
Factual error: The royal parade is supposed to be of the Yorkshire Hussars, but the filmmakers instead borrowed the King's Troop, Royal Horse Artillery, complete with guns. Although the uniform was similar, the Yorkshire Hussars was a cavalry regiment until the Second World War, when it became an armoured regiment. It was never an artillery regiment.
Factual error: The protagonist wakes up supposedly at 5 AM of December 2nd in New York City. Outside, the sun is shining, almost two hours too early. (00:00:15)
Continuity mistake: The dorky protagonist just bumped into the bike shop girl. She tells him "It's all good, man", to which he replies asking how's the bike. Behind him, a woman with a dog makes her appearance. Over 10 seconds of conversation pass, and the woman is still where she was, but in the shot that follows, when she says "I'm Cate, by the way", the woman warped past him, and is now behind her to the opposite end of the sidewalk. (00:07:15)
Continuity mistake: Higinio emerges from his hideout to strangle with the measuring tape the man who is raping his wife. During the scene, the tape is above or below the shirt's collar and with a dangling loose end coming and going. (01:02:20)