- Errors in geography: When the film shows Embankment station, it is actually Charing Cross Underground.
- Factual errors: Although the senior military advisor is referred to frequently as 'Major General' his rank badges are those of a (full) General. In addition, a Major General would be normally be addressed as 'General'.
- Factual errors: The helicopter taking the Deputy Prime Minister to Scotland bears a ZS- Registration for South Africa, not a G- Registration as would be expected. Furthermore he would have been flown by the Military in such an instance.
- Continuity: The fighter bomber shown on the ground was a single seater, however, the plane shown taken off is a Tornado GR4, which is a two seater.
- Errors in geography: The Deputy PM flies from Scotland to London in a small helicopter with a South African registration prefix (ZS) indicating that this sequence was filmed in South Africa (See 'Filming locations').
- Errors in geography: Wick is shown in the opening scene as being in the Western Isles. A later news report appears to show it on Scotland's east coast south of Aberdeen. In fact it is on the east coast north of Aberdeen.
- Factual errors: The Thames Barrier is shown closing all gates in around 30 seconds. In fact, it is closed progressively over two hours. Any more suddenly would cause a damaging reflective wave to "bounce" off the gates.
- Miscellaneous: The emergency team is referred to as COBRA. Technically, this refers to the location, Cabinet Office Briefing Room A, the actual group of people coordinating the emergency effort is the Civil Contingencies Committee or "Triple-C".
- Continuity: In flight scenes involving the Tornado GR4 it is plainly only carrying 2 fuel drop tanks and nothing else. If was sent to destroy the Thames Barrier it should be carrying air-to-ground missiles.
- Errors in geography: Just before the news helicopter reports that there are survivors stranded on rooftops, a scene shows the helicopter from below. The tall brown building in the far right of this shot of the helicopter is Safmarine House, which is situated in the Cape Town CBD.
- Revealing mistakes: In one scene, its very obvious that the Prime Minister's helicopter is a fake, toy one.
- Errors made by characters (possibly deliberate errors by the filmmakers): Surprisingly the panicking Londoners tried to leave London rather than take the simplest and most obvious way to escape from the floodwater - seek refuge on the top of buildings. Nor did the authorities issue such advice.
- Factual errors: At the beginning of the film the wave heights are report in feet. The UK Meteorological Office, as does all meteorological and marine agencies, record wave heights and tidal ranges in meters.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Plot holes: SPOILER: One would expect that more people than just Morrisons and a single soldier would be sent to the Barrier. Also, they should have known in advance that whoever activates the engine room drainage would be underwater for extended time, so they would simply take more oxygen tanks.
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