Continuity mistake: When the cast are at the Miranda colony and discover that everyone is dead, there is a rotating shot of River as she realises what happened. Prior to this there is a brief closeup shot of the rest of the cast as they turn to face her. Jayne turns to his right, but in the following rotating shot of River he has turned from his left. (01:16:30)

Serenity (2005)
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Directed by: Joss Whedon
Starring: Chiwetel Ejiofor, Alan Tudyk, Nathan Fillion, Adam Baldwin, Morena Baccarin, Gina Torres, Summer Glau, Jewel Staite
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Trivia: The ID number (C57D) of the ship on Miranda is the same as the ID number of the ship in "Forbidden Planet".
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Chosen answer: Answering my own question: In the script, Mall specifies that it is an inoculation for the planet's atmosphere.
Brad ★