Enterprise is humanity's first Warp 5 Starship.
	Admiral Forrest confuses the alien species name and refers to them as 'Klingot'.
	The Vulcans insist that humanity is not ready for space exploration.
	Archer's dogs name is 'Porthos'.
	According to Phlox, The Suliban encountered have genetically engineered subcutaneous pigment sacs, compound retinas and two extra bronchial lobes.
	Reed supplies the away team with a new magnetic disruptor called a 'phase pistol'.
	Naralian Children can only breathe methyl-oxide until the age of four. They must be weaned off it to enable them to breathe a nitrogen/oxygen atmosphere.
	Archer meets the Suliban 'Sarin' on Rigel X.
	T'Pol and Tucker are exposed to a protocystian spore on Rigel X and so must receive treatment using decontaminant gel.
	Phlox uses osmotic eels to seal and cauterize wounds caused by energy weapons.
	Liquid phosphorous is not commonly found beneath an atmospheric layer of cyclohexane.
	Archer discovers that Silik is receiving orders from the future via a temporal chamber.
	The Klingon home planet is called 'Qo'nos'.
	Vaughn Armstrong (who holds the record for playing the largest number of alien guest characters on the various series) played his first human role in this episode as Admiral Forrest.
	James Cromwell reprises his Star Trek: First Contact role, Zefram Cochrane, in this episode, although his name does not appear in the credits.
	Gary Graham, who plays Soval in this episode, previously played Tanis in "Cold Fire", an episode of Star Trek: Voyager.
	Thomas Kopache, who plays Tos in this episode, would later play a male Sphere Builder in Season 3's "Harbinger". He also previously appeared in TNG, DS9 and VOY.
	This episode's script establishes that the two Teneebian moons that Ensign Mayweather visited when he was young were originally two Andorian moons.
	Rigel X was also the last place visited by Enterprise before its decommission in 2161.
	This episode marks the first appearance of the Denobulans, in the form of Phlox, although the name of his species would not be revealed until "Terra Nova".
	The Temporal Cold War plot, which began in this episode, would eventually be concluded in "Storm Front, Part II".

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