Continuity mistake: When Daniel and Henley are walking up the staircase to the apartment, as she talks about Daniel's "anonymous posting" on her website, Henley has her bag strap on her shoulder. The shot changes to them reaching the top of the staircase, and the strap is suddenly off her shoulder and the bag is now behind held by her arm. (00:10:00)
Continuity mistake: After Merritt calls Daniel a control freak and Henley says it doesn't take a mentalist to figure it out, Daniel then says he would take it as a compliment. After he says this, the shot cuts to Henley looking at Merritt saying "Only he would take it as a compliment." In the next shot, Henley is suddenly looking at Daniel. (00:11:00)
Continuity mistake: When the magicians are standing outside the apartment showing each other their tarot cards, Daniel shows his tarot card The Lover whilst looking at Jack, but in the next shot, he is looking at Henley. (00:11:55)
Continuity mistake: When the Horsemen are congratulating Tressler at the Las Vegas show, as Daniel says "I want to say when we came to Mr. Tressler", Merritt and Henley are looking at Daniel, but in the next shot, are looking at the crowd. (00:18:05)
Continuity mistake: Merritt is doing a mental trick on a couple and starts by putting the wife into a sleep. In a long shot of the cafe, the husband is shown looking around the cafe. The shot cuts back to Merritt and the couple, and the husband is looking at his wife and Merritt. (00:02:10)
Continuity mistake: When Merritt mind reads the husband, he says "Beach. Cocktail. Florida?" and the husband replies claiming it was a business trip. As the husband says this, Merritt's hand is raised, but when the shot cuts back to Merritt, his hand is suddenly lowered. (00:02:35)
Continuity mistake: After Jack has performed the magic trick with the spoon, a member of the crowd pulls a spoon and a snapped utensil from his pocket and shows it to the crowd, one in each hand. The two items are level with each other. The shot cuts and suddenly his right hand is lowered whilst the left hand is still raised. (00:04:55)
Continuity mistake: When Henley is first looking at 45 East Evan Street, her tarot card is in her hand, pushed up against a cup of coffee. By the time she meets up with Daniel, the card is no longer pushed up against the coffee cup, but instead in one of the other fingers. She couldn't have moved the card, because her bag was in her right hand and the coffee was in her left. (00:09:30)
Continuity mistake: At the start of the plane scene to New Orleans, Merritt says "Allow me to make plain what we've both been thinking." At this moment, Merritt is resting on a pillow with a T sign stitched onto it. Merritt is first shown to be resting on the T, but a couple of shots later, Merritt is suddenly on the other end of the pillow. (00:39:55)
Continuity mistake: When Jack picks up the wet cloth to shove into Agent Fuller's mouth, there is a tap in a sink with a cloth and the tap is pointed to the left. Then as Jack drags Fuller over to the garbage disposal in the sink, the tap is suddenly pointed forwards. And when Jack shoves Fuller's jacket sleeves into the garbage disposal, the tap is pointing to the right. (01:17:20)
Continuity mistake: When Daniel finds the tarot card, he goes over to it and it is positioned on the edge of the table, then in a close-up, it is suddenly slightly over the edge of the table. (00:08:10)
Continuity mistake: When Jack gives the man the $100 for figuring out his trick, he leaves, walks down a flight of steps and turns around a corner and walks by a mysterious man. In the next shot, he is shown walking past the exact same corner at the edge of the steps a second time. (00:05:10)
Continuity mistake: At Pont des Arts in Paris when Dylan reveals his true self to Alma, the right page shown in the newspaper changes layout and stories. An earlier shot does not show a story about 12-year old Dylan while it's there in the second shot. (01:43:40 - 01:44:00)
Continuity mistake: There's a space issue with the scenes of the safe in the truck. They show Agent Fuller coming around on the (viewer's) left side of the safe to show the Horsemen video. However, when we first see the safe in the truck, there is absolutely no way a man of Fuller's size can fit in the gap between the safe and truck wall. (01:22:35)
Continuity mistake: When the car crashes on the bridge, it slides against the barrier on the middle of the road and flips over. As it slides, the bus on the next lane is seen to be more ahead of the car. The shot then cuts to Fuller yelling out "Oh, shit!" and it cuts back to he car flipping over. Only now, the bus is suddenly right next to the car, ready to drive past it. (01:23:50)
Continuity mistake: On the bridge, as Dylan and Alma chase Jack, a bus drives in the way of Jack's car. When Jack's car is shown again, a quick shot from the front of the bus is shown. Although the light reflects on the window and we can't see the driver, we can see, just for a moment, that there are hardly any passengers on the bus. Later on, when Thaddeus is explaining how the Horsemen faked Jack's death, Merritt is shown to have been the driver of the bus, and in the passenger seats are dummies, rather than the almost empty bus shown before. (01:23:40 - 01:44:35)
Continuity mistake: When Dylan and co are in the truck, finding out that his phone has a bug in it, Dylan tells the female agent to put the bug back in his phone. As Dylan says "They don't know that we know about the bug", Alma is looking at Dylan. Next shot, she's suddenly looking at the female agent putting the bug back in his phone. (01:14:05)
Continuity mistake: As Daniel, Merritt and Henley are in the elevator, the first shot of the elevator (exterior shot) shows Merritt standing a couple of inches away from the wall. A couple of shots later, Merritt is suddenly standing in the corner of the elevator. (01:36:30)
Continuity mistake: When the car blows up, visible to the right of the car is a tyre that fell off during the crash. The explosion is then seen going over the tyre. When the fire clears the tyre isn't there anymore, but it reappears a few shots later. (01:24:40)
Continuity mistake: As Dylan chases the Horsemen through New Orleans, he runs onto a street where there is a huge crowd. A police car stops in front of Dylan. In the shot where the police car stops, Dylan is standing next to the car, but standing in front of the car in the next shot. (01:05:35)
Answer: The mirror was inserted at an angle, so that the reflection was the ceiling and not what was in front of them. It's the same principle for how periscopes work.
Bishop73