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Goof: When Porthos licks the comatose Archer's face, Scott Bakula winces before the camera angle changes.
Nitpick: There is no apparent reason for Phlox to wander the corridors with the lights off, using a flashlight, other than to create the frightening setting.
Trivia: The movie Phlox watches in the episode is 1956's The Court Jester.
Mission Date: December 27, 2153
Mission Date: December 12, 2153
Mission Date: December 6, 2153
Goof: When Archer and T'Pol first steal the SUV, as they drive away there are flashing orange lights in the left exterior mirror. These are most likely from the follow car that would be required as the shot takes place on open roads.
Goof: Although this episode takes place in Detroit, the shot of the downtown is of Los Angeles.
Goof: Archer says that Daniels is from the 30th century. However, in previous episodes Daniels identifies himself as being from the 31st century.
Nitpick: It seems odd that for a ship that was running low on just about every supply and material, that Enterprise had a torpedo to spare to be Sim's coffin.
Trivia: Archer's model starship he plays with as a boy in "Broken Bow" reappears in this episode.
Trivia: Sim tells Archer that he can't think of anything worse than spending his last days in the shuttlepod, and then corrects himself, saying that it would be worse to be trapped inside with Malcolm. This, of course, is a reference to season one's "Shuttlepod One", in which Malcolm and Trip, fearing that Enteprise has been destroyed, are trapped together aboard a shuttlepod for several days.
Nitpick: Archer seems to think that the humans on the planet would be safe. By this time it is well-known that the Xindi want all humans killed and have been tracking Enterprise. The humans on the planet now appear to were in more danger now than before.
Goof: Bennings shoots Bethany on her exposed left side, but when Dr. Phlox is pulling the bullet out, he's taking it from the right. Later when she's commenting on how she doesn't have a scar from it, she's looking at her left side again.
Though erased when the timeline is restarted, T'Pol becomes Starfleet's first Vulcan captain.
T'Pol and Archer have settled on Ceti Alpha V, the same planet Captain Kirk strands Khan Noonien Singh after his failed takeover of the Enterprise in The Original Series.
As part of the alternate timeline of this episode, the completed Xindi super-weapon is shown destroying Earth.
Nitpick: As with many time-travel type stories, this episode creates a temporal paradox. If, when Phlox destroys the clusters of parasites, they cease to exist even in the past, it would stand to reason that Phlox should no longer have had any parasites to destroy.