At one point during the return flight there is a bang and nobody is very alarmed; it's just a "burst helium disk." This was actually a significant event, though an expected consequence of the situation. The helium disk served a protective function in the LM descent engine and, after it burst, they might no longer be able to restart that engine. A final course correction, not shown in the movie, had to be done using thrusters instead.

Film

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