Continuity mistake: When Walter and Tressler arrive in London, Walter gets into a car and begins to close the door. Chase is behind the car walking up to it, but when the car drives off in the next shot, he is suddenly standing beside the car, standing completely still. (01:28:45)
Continuity mistake: After thinking they have thrown the Horsemen off the plane, Tressler peels off the label to the bottle that he and Walter are drinking from and finds the tarot card on it. He is holding the bottle by the bottom when he peels the label, but when he hands the bottle to Walter in the next shot, he is holding the bottle by the top. (01:46:40)
Continuity mistake: When the Horsemen are exposing Owen Case at the OCTA party, as Lula says "He's mocked your privacy. He scorned it", she is standing facing the audience and is mostly covered in stage light. The shot then cuts to Daniel talking, and Lula, visible to the right of shot, is now standing facing Daniel and only half covered in stage light. (00:22:40)
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 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 the Horsemen arrive at the Macau Science Centre, Allen Scott-Frank tries talking with the South African gangster and is ignored. The gangster rolls up the window and the shot cuts to the Horsemen. Daniel is shown looking towards Merritt, but when Allen says "or not" in the next shot, Daniel is suddenly looking at Allen. (00:54:05)
Continuity mistake: When Jack is showing Merritt how to throw cards, just after he throws the last card, Merritt says "Not bad" looking straight forward at the card, but in the next shot, Merritt is looking at Jack. (00:12:40)
Continuity mistake: When the security guard at the OCTA launch finds the Evans Mental Facility wristband on the CCTV guard's wrist, the wristband and wrist are pointed away from the CCTV guard's face, but in the next shot, the wristband and wrist is directly facing the CCTV guard. (00:18:10)
Continuity mistake: When Daniel is performing in London, there is a wide angle shown in the scene, with Daniel under blue lighting. In all other shots in the scene, he is under white stage light.
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