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Martin Donovan (Bryan) is absent from this episode.
Henry says that he camped on top of Aryes Rock in the middle of a lightening storm. However this isn't allowed as the aboriginal people consider even the act of climbing it to be disrespectful and as Henry previously mentioned that he lived with an aboriginal tribe he would be aware of this fact and unlikely to desecrate a holy site.
This is the first episode Martin Donovan (Bryan) doesn't appear in.
Should have been the second episode to air, not the eighth, as it is in this episode that Henry's hammock and the online teleconferencing are set up; both of which were already set up in previous episodes.
This episode featured the song "Your Gonna Go Far, Kid" by The Offspring.
Goof: When Henry, Maggie and Jasper scratch the dirt away from the object they discover that it is Sputnik-1 complete with "Sputnik-1" in bold letters on the surface. In reality the word wouldn't have been written in English, it would've been written in Cyrillic as "Спутник-1".
This episode featured the song "Today is Gonna Be Mine" by David Gilmour.
Goof: A clothing continuity goof occurs when Henry climbs the brick wall during a chase scene. At the beginning of the scene, Henry wears a pair of Converse low top Black Chuck Taylor All Star sneakers (UK plimsolls). When he climbs the brick wall he is no longer wearing Chucks, but a completely different pair of sneakers (UK trainers). Once he reaches the top of the wall and climbs over it, though, he is again wearing Chucks.