* ExecutiveMeddling: Originally, [[spoiler: Dr. Susan was to survive and Preacher would be sharked.]] Test audiences found [[spoiler: Susan]] to be such an [[TheScrappy irritating twerp]] that this was inverted. [[RuleOfCool Makes for a damn fine climax]].
* HeyItsThatGuy:
** Ronny Cox shows up ''very'' briefly in the beginning, where he doesn't even say anything. Presumably the footage was cut.
** [[Series/TheSopranos Tony's sister Janice]] is handling the communications at the research station.

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