Corrected entry: Many times in the movie, the Capcom refers to the CM and LM by their individual call signs, "Odyssey" and "Aquarius." In real life, those call signs would only be used when the LM had separated from the CM for a lunar landing. While the two ships were docked, as they were in this case for the entire mission, the single call sign "Apollo 13" would be used instead.
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Correction: While this is true for a "routine" mission, Apollo 13 was not a mission anymore once it became "an emergency" situation. Remember that Lovell and his team had to use the Lunar Module as a "lifeboat" to survive the trip home. They don't refer to the Odyssey and the Aquarius separately until after the explosion. On a normal mission, the lunar module would not be attached to the SM or the CSM for the return trip. Using the call signs as opposed to similar sounding terms LM, SM, and CSM was also done to avoid confusion for the astronauts, as everything they had to do to get home was an unorthodox method that had never been attempted before, and the cold and lack of sleep was making it harder for them to concentrate.
Jazetopher