Trivia
Near the end of the episode, when Saffron is in the garbage crate, we can see lots of rubbish, but it is shown in the episode that after each piece of waste is disposed, the crate is taken away to the reclamation area. On top of this, the whole system itself seems inefficient. The crates are big enough to store lots of rubbish, but they are picked up 30 seconds after a piece of garbage has been disposed. Surely, it would be more cost-effective to wait until the crate is full before taking it for reclamation?
Among the items in the "Earth that was" collection there are several US dollar bills; a U.S. telephone box; a model sailing ship; several vases; a grand piano; a grandfather clock; and several paintings, including the Mona Lisa.
The outfit that Inara is wearing at the end of the episode is the same one she is wearing the flashback in "Out of Gas."
At the end of the episode, when Mal is butt naked and talking to Zoe and Wash, when they're leaving him Wash tells Zoe, barely audibly if you listen carefully, "Zoe, he's Jewish!" You can try guessing what he's referring to.
At time index 17:45, as Mal's shuttle is landing on the island, a spacecraft can be seen flying from right to left in the background. This "spacecraft" is actually a Lockheed SR-71 Blackbird, a US supersonic reconnaissance aircraft which was first flown in 1964.
When Kaylee is reprogramming the garbage can, the screen next to her clearly shows a Windows desktop (with what looks like the new hardware wizard at the first step). Time index on the DVD copy of the episode: 21:41