Goofs

After all four characters are pulled from the Thames and wrapped in red blankets at the end none of they are even slightly wet! Really poor on the continuity dept.

At the beginning when Em is spying on Alice they say she is 13. This doesn't fit the time line of 15 years. It is later restated that Alice is 14 at the club scene. This would then match the 15 year time jump.

During the cafe scene when the kids are given a full english breakfast, the plate has a serving of mashed potato on it which is not, and has never been a part of a full english breakfast. Also the server offered then blood sausage when it universally known as black pudding.

When the plane falls off the cliff it explodes. This wouldn't happen as the wings hold the fuel and had already fallen off of the plane.

The Key is shown with a USB-C type connection, USB-C was not introduced until 2014.

Chuck says that the Thames barrier stops the Atlantic ocean from flooding the city, but the Thames doesn't open into the Atlantic ocean. It opens into the North sea and the barrier isn't closed permanently. it only really closes at particularly high tides and for maintenance, so the vast majority of the time, it's open.

The plot revolves around obtaining or recovering an electronic key that grants access to all the world's secure systems, something conceptually flawed on a number of levels including: properly-secured critical systems are not networked; security is based on public-key encryption, not a special key; getting ALL the countries in the world to agree on a common system is implausible; and for the majority of the film, the key is fifteen years old, and technology moves on.

Glenn Close's character would have set up much better surveillance and security at her estate than what she has in this film, unless she set up the level of security she believed she needed.

Diesel Pump handles are Black which means you wouldn't be able to use it like a flame thrower like they did in the film. Diesel is not flammable until highly compressed, unlike Petrol. Of course it may have been a petrol version.

British fuel pumps require users to keep the handle trigger pressed down to function. Without it, no fuel is pumped and the tank isn't filled. Neither parent is seen touching the handle but the car is still successfully refueled. Actually pumps have a mechanical switch that allows hands-free operation.

When they followed their children through the ring, their children were not even at that location yet but they arrived there at the same time with them, dressed and prepared.

When filling up for fuel, the family seem to have discovered an English petrol station with American petrol pumps.

They started at Tate modern, then Waterloo further west on the south bank, then to tower bridge back east.

Also when they picked up the family and they are seen at the quay side that is canary wharf/westferry and in the docks, not on the Thames and nowhere near the Thames barrier you wouldn't take them there along way back in to London, Greenwich would even be nearer.

At 30 minutes when Chuck Andrews is shot at Emily and Matts doorstep, Matt pushes his wife out from the door frame into the open so they can look Chuck. Hardly something a trained operative would to.