When Ruby was struck in the face, her bleeding nose bled all over her white blouse.
When she is doused with water from the sprinklers and subsequently, there is no trace of the blood.
As the plot unravels, the Cabinet Secretary says that he is just a politician. In the UK, the Cabinet Secretary is a member of the permanent Civil Service - not a politician.
A pilot would not simply respond to an air traffic control instruction with "roger". They are required to read back the instruction to demonstrate they have understood it.
Commercial airliners could not get that close without knowing about each other. Airliners have had a Traffic Collision Avoidance System since the 1970s. These would have given both pilots proximity warnings long before they were within visual range. Pilots can take whatever action they deem necessary for the safe separation of the aircraft without needing instructions from air traffic control.
A shot showing smoke rising over London, is wrong. The riots where shown taking place around Whitehall but here it is indicated taking place around the City of London.
The conspirators were attempting to crash two planes together by giving them false air traffic control commands. All airliners are fitted with TCAS, a system which would independently warn the pilots of an imminent collision resulting in them taking evasive action regardless of ATC instructions.