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There's mention of interpreted sections in the code. Do you know if it was possible to manually enter interpreted code to have it ran by the system afterward - or even program some of software by hand (being dictated hex) in case something unexpected occurring during the mission warranted it?

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All of the code was in read-only memory (core rope), so it was impossible to modify it.

There was at least one case when the behaviour of the code was significantly changed in flight to work around a hardware failure (shorted button). This involved changing the writable memory, which kept all the state, to selectively disable some parts of the lunar landing program. For more details see:

http://www.ibiblio.org/apollo/#Final_exam_for_the_advanced_s...

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