"Greetings from Earth" was originally aired as a 2 hour TV movie.
Goof: When the decontamination chamber door is opened and the crew step into the ship, absolutely nothing happens. The doctor made it clear that the ship had zero atmosphere inside, which means it was a vacuum. When the door opened, air from the Galactica should have been sucked in to equalize the pressure, which would at the very least have tousled their hair or capes as it rushed around them.
Closing credits are shown in a different style than previous episodes in the series. The credits scroll from bottom to top as they roll which may suggest that the episode could have been intended as part of a movie at some point.
Highlights from "Greetings from Earth (2)" are shown prior to closing credits of episode.
Highlights from episode are shown prior to opening credits of episode.
Goof: Considering that Galactica is on a mission to locate planet Earth, there should have been some kind of protocol in place regarding the possibility of contact with extra-colonial humans. The faulty decision-making and infighting depicted here is, sadly, probably closer to reality.
Boxey: Oh, Frak!