Continuity mistake: When Walter is explaining his plan, after telling Merritt they may not be having fun but he is, Walter begins to walk away from the Horsemen, but in the next shot, is suddenly standing several meters from them. (00:36:30)
Continuity mistake: When Walter tells the Horsemen that the tube they were meant to jump down was twenty meters to their right, he tells them to sit down. When he is telling them to sit down, his right arm is still and motionless. When the shot cuts, his right arm is moving back and forth. (00:36:40)
Continuity mistake: When Walter Mabry is explaining how the Horsemen ended up in Macau he walks over to sit on the couch to show the slideshow of the plane trip. As he walks over, Atlas is not on the same couch as the other Horsemen, but when Walter goes to sit down he squeezes between all of the Horsemen with Atlas now on the end of the same couch as everyone else. (00:37:03)
Continuity mistake: When Walter is explaining his relationship with Owen to the Horsemen, Merritt's position changes whenever the shot is on him. He is either sitting on the couch with his arm on the arm rest and leaning forward, sitting with his arm on the arm rest and has his back against the couch or sitting with his back against the couch with his hand in his lap. (00:37:45)
Continuity mistake: When Walter is requesting the Horsemen to steal the computer chip, Merritt is seen with his bow tie untied. Whilst Walter is explaining that the chip is being previewed tomorrow, Merritt has the left side of the bow tie mostly covered up by his jacket, with some of the bow tie sticking out from it. After Walter says they just need to inspect and steal it, the entirety of the left side of the bow tie is now entirely obscured by the jacket. Walter then says back home they are wanted criminals and suddenly, part of the left hand side bow tie is suddenly sticking out from the jacket again. (00:38:45)
Continuity mistake: When Dylan is trying to get into the prison using Cowan's badge, the guard at the desk takes the badge off him to look at it. Part of his little finger can be seen under the bottom of the badge. But in the next shot, the entirety of his little finger is sticking out from under the badge. (00:40:05)
Continuity mistake: When Dylan enters Thaddeus' prison cell and begins looking around, there is a clock on the wall showing 7:52. As Thaddeus walks into the cell seconds later, the time on the clock is suddenly 7:55. (00:40:39)
Revealing mistake: When Dylan is looking at the news articles in Thaddeus' cell, the camera pans over to one of the articles with the headline, "I am a victim": Thaddeus Bradley. The opening paragraphs on the first column are repeated throughout the entire article. (00:40:45)
Continuity mistake: The analogue clock on the wall in Thaddeus' prison cell goes back in time by 5 minutes from 7:57 to 7:52. (00:42:10)
Continuity mistake: At the magic shop, when Daniel is reading out the list to Li, Daniel first has his right hand on the paper, but in the next shot, he is holding the paper with his left hand. (00:44:20)
Continuity mistake: When Merritt and Chase leave the magic shop to go for a drink, Jack has his hand placed on top of a reverse rain machine. The shot then cuts to a closer angle of the reverse rain machine where his hand is no longer on top of it. (00:45:20)
Continuity mistake: When Dylan is leaving the prison with Thaddeus, it is night time. But later on in the movie, when the FBI director and Agent Cowan are watching the CCTV footage of Dylan and Thaddeus leaving the prison, the time on the CCTV shows them leaving the prison at 14:10, the middle of the day. (00:46:10 - 01:08:09)
Continuity mistake: When Dylan and Thaddeus are leaving the prison and are about to get into the car, Thaddeus tells Dylan his sources are telling him the Horsemen are in Macau. When he finishes the line, he is looking down at the car, but in the next shot, Thaddeus is suddenly looking at Dylan. (00:46:30)
Continuity mistake: When Lula is showing Jack the belt that she pick-pocketed, she is holding the belt with the buckle dangling at the bottom, but in the next shot, the belt is suddenly being held by the buckle. (00:47:30)
Continuity mistake: While Chase and Merritt are drinking in the bar, in one shot Chase is wearing sunglasses, in the next shot the sunglasses have disappeared. (00:48:10)
Continuity mistake: When Merritt and Chase are talking at the bar, they are sitting side by side facing the bar, but when the shot changes, they are suddenly turned 90° to face each other. (00:48:30)
Audio problem: In the bar, when Chase is telling Merritt his ploy of distracting him while the other Horsemen screw over Walter isn't going to work, whenever the shot is behind Chase, Chase's mouth movements do not match the dialogue when he is speaking. (00:48:35)
Audio problem: Jack "hypnotises" Chase in the bar to make him apologise to Merritt and slaps Chase on the face to wake him back up again. Chase then says "Merritt", but his lips don't move. (00:49:00)
Continuity mistake: When Dylan and Thaddeus are first seen inside the plane, Thaddeus says, "I've had ample time to do some research and you know..." while leaning forward in the seat he is sitting in. When the shot cuts, he is leaning back against the seat. (00:49:25)
Continuity mistake: While on the plane, Dylan walks over to Thaddeus' seat to berate him. In the shots focusing on Thaddeus, Dylan has his hand placed on the top of the seat, but in the shots focusing on Dylan, his hand cannot be seen on the top of the seat. (00:51:05)
Answer: The only ones who knew the chip was fake were the Horsemen, no one else did. Walter did not know the chip was fake. The plan was to convince Walter that the chip was real so that they could lure him out of hiding with Walter attempting to kidnap and later kill them, and expose Walter to the public in doing so. They told the crowd after exposing Walter about the chip, because while it was a fake, they still had plans with it assuming it was real. If by "alert the FBI", you were referring to when Dylan gave the FBI director the evidence on Walter and Tressler, that was not the chip he gave to her, that was a hard drive containing all of Walter and Tressler's past dealings.
Casual Person