FBI Deputy Director Prigg is seen on the phone in one scene. In a scene that follows, he is no longer speaking on the phone, but his image in the mirror shows that he is.
During the attack on Clay's warehouse, the thug that Clay captures with his screwdriver doesn't have his shotgun, yet he entered armed. The gun disappears without any explanation (or noise) when Clay subdues him and the thug hold his hands up.
At the end of the film, when Clay is putting on the diving gear, his drysuit is dripping water and obviously wet, before he even gets in the ocean, indicating that the sequence had been shot at least once before.
After she was sworn in the President's home, the Danforth Estate, would have been extensively modified by the Secret Service with bullet-resistant or bulletproof exterior windows. And if she was in residence there would have been Secret Service patrols on the beach AND out on the water, keeping all watercraft at least a mile and a half away and ensuring some schmuck couldn't just walk in along the beach. None of those were present.
In one scene, Clay removes the barrel from a shotgun (on the fly) and stabs the user with it. The barrel of that shotgun must first have the end cap unscrewed and removed before the barrel can be separated from the rest of the gun.
At around 46 minutes an FBI tactical unit is stopped from proceeding by the leader of the private security company waving a sheet claiming his team are there on the direct orders of the Governot, and tells the FBI tactical team to leave.
This is absolutely not true in real life. The FBI is a federal agency. It is not under any direct state control by any governor of a state.
Regardless of their country of operation, the secret service tend not to walk around with large SECRET SERVICE badges on their back.
When the elevator hits the ground floor as the FBI and Boston PD are entering one of the doors is blown off and hits the Boston PD officer closest, knocking him backward and down the stairs, yet NONE of the FBI agents present check to see how badly he'd been injured, despite him not getting up again. This would have been the FIRST action a real Law Enforcement Officer would have done ... evacuate the injured.
In one scene, Clay removes the slide from a Glock handgun without pulling the trigger. Glocks MUST have the trigger pulled and the slide pulled back slightly before the takedown tabs can be pulled down simultaneously to release the slide.
Clay throws Pettis through a big pane of glass. It shatters into tiny pieces. Later, as Pettis is picked up by law enforcement, he states that he was thrown through a plate glass window. Not only wasn't it a window, it wasn't plate glass either. Plate glass breaks into large shards. Safety glass breaks up into the tiny pieces seen. Plate glass is a figure of speech, the character would not know if it was plate glass or safety glass.
The last scene, Clay goes upstairs 2 levels so it seems with the fighting going upstairs to get to the president's son. He enters the library and, to escape, he jumps out of the window. Next scene he is outside on the ground and the broken window is shown being on the ground floor.
At 1:38:46 (the very ending of the movie, trying to protect the president), FBI agent Verona Parker threatening the beekeeper with an M4 without a magazine.
When Agent Parker is briefing the Deputy Director she states "He's killed six people today ..." when in fact she knows it's actually ONE today, the other Beekeeper, and EIGHT the previous day, since Garnett had already been found. Any people killed at the gas station, including the cops (and excepting the Beekeeper) weren't killed by HIM, but by the actions of the OTHER Beekeeper, and the FBI had CCTV footage as proof.
While at the Nine Star United building the agents can be seen climbing multiple flights of stairs to reach the call center while the lights from the police cars are shining in the windows of the call center as if they were on the ground floor.
Adam Clay is seen to apply a tourniquet on his arm. Few moments later, he is using that arm without any problem, despite the tourniquet still being on. It is barely possible to move an arm with a properly attached tourniquet, let alone be able to use the arm to pick up and manipulate items with it.
Mr Clay holds the paper bag and electrocutes the bees with his bare hands. In real life, he would have been stunned.
Then the bee keeper is talking to the daughter in the kitchen having juice and coffee .. can see the crew in the chrome toaster . Sound guy in white tshirt .. a camera and someone in the background.
Despite being set in the US, the entire movie is very clearly entirely filmed in the UK. When the SWAT team is entering the Nine Star United building, double-yellow lines are seen painted on the roads (a familiar parking restriction) and a Tesco superstore can be seen in the background. Plus the iconic lift-bridge seen in the film is the Kings Ferry bridge, which connects the Isle of Sheppey to the rest of Kent.
As soon as the first shot was heard, the President should have been evacuated immediately, yet she stays and has no detail nearby. Also, armed thugs near the President's location are unheard, which is impossible.
When Parker is updating the Deputy Director vie Video Link she says Danforth Enterprises was "founded and operated by Jessica Danforth." But when Jessica and Derek were arguing in the study after Clay began his assault she says "Your father built an empire!" signifying the company wasn't founded by Jessica, but by her husband, and she just took over as CEO after he died. Pres. Danforth doesn't say that his father built Danforth Enterprises, just an empire Danforth could have taken the capital from that "empire" and founded Danforth Enterprises with it.
Parker states to Wiley that the Minigun fires at 6000 rounds a minute. That is false, the Minigun fires at either 2000 or 4000 rounds a minute which is user selected on the firing controls.