Factual error: When the archangels jump from the helicopter, the "bait" is looking behind him saying he can see the dragon. For a parajumper to look between his legs to view behind himself, he would de-arch and thus de-stabilise himself while travelling at that speed. It would send the jumper into a barrel-roll spin.

Plot hole: The Americans allegedly landed at Manchester on their way to kill the male Dragon in London. London is due south of Manchester. Why then did they head in the complete opposite direction to Northumberland?

Revealing: It's nice to see that Alex (the helicopter pilot), is able to keep herself in such nice and kempt condition. Look at her... clean, washed and combed hair, makeup, and she's actually got lipstick on in one of the scenes.

Plot hole: They make a big deal about attacking the dragons at twilight. But, apart from the poorly blue-screened shot of McConaughey on top of the tower, there's no sign that the final fight happens anywhere near twilight.

Plot hole: A starving, hundred tonne creature incinerates Quinn's little veggie patch, then stops to devour the ash. Later Quinn comes back and finds the tomato vines blackened but still there, their stakes intact (not even knocked down), and even some crisp but still edible fruit on the vines. I guess the dragon wasn't so hungry after all...

Continuity: I've seen it in other films but in this one it gets almost ridiculous. Van Zan's beard changes from pretty thick when he's introduced to almost shaved the same day after the first dragon fight then back to thick and fat a couple of days later while in London. Even if we believe he shaved after the dragon fight - which shouldn't be the case since the camera follows him almost the whole time - there's no way it got that fat 2 days later.

Continuity: When Van Zan is showing the dragon tooth to Quinn, the chain that's holding the tooth keeps moving around the entire scene from on his hand to around his hand, etc.

Other: In the scene where Alex is flying away from the castle on the way to London for the first time, you can see a train moving along the bottom the mountain.

Factual error: At the end of the film, in the battle with the male dragon, what are American traffic lights doing in London?

Continuity: When the tanks are first entering Quinn's compound, at one point, you can see that on one of the tanks the treads aren't moving, but the tank is.

Continuity: In the scene where Van Zan shows the dragon tooth to Quinn, Van has a cigar in his hand. But as he lowers his hand, the shot changes and the cigar vanishes.

Factual error: When newspapers are flashed on screen to demonstrate how the dragons have destroyed the countries, one of the headlines reads "Europes' capital cities in ruins." It should read "Europe's capital cities in ruins."