Continuity: When Mike and his friend escape from the helicopters in El Salvador, Mike's hair, clothes and camera are wet just before they pass in the river. They were not wet in the previous shot.

Continuity: During the battle in El Salvador, the jar on the chair behind Mike and his friend is shot. Some shots later, the jar has disappeared.

Continuity: When the old woman firebombs the Visitor craft, the scene changes from broad daylight to dusk, and then back to daylight again. The three Visitors standing in front of the 'Valley Cleaners' shop also disappear.

Revealing: When Donovan escapes from the L.A. mothership with Robin and the Mexican, he once turns the fighter he is using upside down by mistake. But since the passengers have their heads hanging down then, how come Robin's long hair does not?

Continuity: When Julie and Robert infiltrate the hospital using the forged passes, the pass is shown twice as it is inserted into the reader. In the first shot, it slides in down whole, but the reader is still buzzing. In the second, the card starts sliding in again.

Continuity: When the fake Donovan is trying to rescue Julie, he is shot from behind. But in the next shot, the scorch mark is on his chest.

Revealing: After the failed raid on the Resistance's headquarters, Brian shoots the counterfeiter who led them there, but no scorch mark appears on his victim's shirt (later victims have these scorch marks).

Revealing: When Julie is almost converted, a fake Donovan bursts in and starts firing a blaster rifle. Look closely at the first shot: the rifle is held way too high, so the shot should have gone into the ceiling; yet the blast goes straight forward.

Plot hole: During the raid on the pumping station, Elias overpowers a Visitor guard and throws him off the catwalk - into a hall full of workers, engineers, and even more guards. Strange that no one notices.

Plot hole: Diana manages to escape at the end by stealing a shuttlecraft. But how did she manage to get there, when most of the mothership (and certainly the landing bay) was contaminated with red dust?

Revealing: During the final battle in the mothership hangar, Donovan shoots a Visitor soldier who falls off his catwalk onto a transporter. When he impacts, a styrofoam block used to cushion his fall bounces off the roof.

Factual error: When the world celebrates the Visitors' flight, there are scenes of joyous people from all around the world. Curiously, in each of these scenes it is daytime - even in Italy, China, and India, where it would be either night or dawn, given that L.A. time of the attacks is between 11 and 12 AM.

Continuity: When the Red Dust is spread, there is a brief shot of some California citizens watching, and we see the Bernsteins among them. But the actress at George Mofogen/Mr. Bernstein's side is not Bonnie Bartlett, who played Mrs. Bernstein in the first two episodes.

Factual error: As the Visitors are evacuating the mother-ship's control room, we see outside and the view over Los Angeles is obscured by a thick red smog. There's no way the red dust would be concentrated like that, given the limited quantities that were dispersed.