Continuity mistake: In the middle of the hotel fight when Toby and Deliverance go through the door in their hotel room you see the door open and a number of shots impact it. The characters then go through the second of the double doors. This is commented on in the DVD commentary. Not only do the bullets not go through the second door, they don't go through the first. On top of that, you see a shot with the two doors opened, but when the bad guys enter the room the double doors miraculously turn into just one! This layout is then used for the rest of the scene.
Continuity mistake: In the scene where the postman gallops by the country house full blast and then comes back to pick up the letter from the boy's hand, you hear hoof sounds for long enough to take him hundreds of metres away, while the camera is on the boy. But when he is actually shown stopping to turn his horse around he has only come as far as the corner of the premises, maybe 20 meters away. (01:53:05 - 01:54:05)
Factual error: In one shot, the camera is on the platform at Tottenham Court Road station, and a sparkling new train rushes in. Wrong type of train - the one used is from the semiautomatic Victoria Line stock. I suppose London Transport must have been too ashamed of their Central and Northern line trains to have allowed them to be filmed.
Continuity mistake: When Ullie Birve's character is taken from Earth near the end of the film, her clothes fall to the ground. In the moments just prior, she is shown fading in and out, but so do her clothes.
Continuity mistake: In the scene where Asuka is fighting against the JSDF aircraft, her umbilical cable is severed and she ejects the umbilical plug. She then expands her AT field and the plug is connected in her back again. In the next shot, it isn't there.