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Goof: Captain Archer states that Shakespeare only wrote thirty-six plays, but Shakespeare is credited with writing thirty-seven plays over the course of his life, though some are disputed as to his authorship.
Nitpick: When Trip secretly goes to meet with the cogenitor, he tells the Vissian engineer that he's going to the mess hall. However, throughout the rest of the episode, everyone (including him) seems to think that he claimed to be going to Astrometrics.
The wars fought between Denobula and Antara were in the 19th century. Phlox's grandmother lived through the final war, implying that Denobulans have a long life span.
The tables in the mess area of the Horizon are identical to those seen in the mess of Star Trek Voyager.
T'Pol is being polite, accepting and eating the popcorn that Archer offers her at the movie night. As has been previously explained in the season one episode "Shadows of P'Jem", Vulcans don't eat with their hands.
Mission Date: January 10, 2153
Nitpick: Travis tells his brother that he'll ask Malcolm to help remove the homing beacon from the Horizon's hull. However, upon coming back aboard Enterprise, Travis makes no such request, and even hides from Archer that they had trouble with any hostile aliens.
Nitpick: Archer tells Mayweather that his father had recommended him for the position, and both act as if this is the first time he has shared this information. However, Archer had previously revealed this in the first season.
Trivia: Jonathan Archer is condemned to the dilithium mines of Rura Penthe. In the Star Trek: The Undiscovered Country, James T. Kirk and Leonard McCoy are also convicted in a Klingon court and then imprisoned on Rura Penthe.
Trivia: Though the Duras seen in this episode is a disgraced officer, his family will gain considerable standing in later years so that by the 24th century, another Klingon named Duras will be an extremely powerful member of the High Council.
Trivia: Duras is described as being the son of Toral, which is also the name of the later Duras' son.
First Appearance: Non-corporeal beings (chronologically)
Goof: Without realising that she had been possessed by one of the aliens, Archer tells Hoshi to evacuate the crew into the catwalk. She responds, saying that they should stay where they are. However, when Phlox later enters Hoshi's quarters, she demands to know where the rest of the crew is, even though Archer told her of his plan.
Trivia: The healing device used to heal Lt. Reed's leg in the episode "Dead Stop" can be seen in the background of Shuttle Bay 2 when Archer and T'Pol are examining the alien ship.
Trivia: The uniform worn by the dead 31st century historian is similar to that worn by Daniels in many episodes.
Nitpick: Although it was Soval that negotiated the original treaty, his presence here seems out of place, considering that he's the Vulcan ambassador to Earth.