The spoken “Egyptian” was heavily accented Middle Egyptian transliteration and a lot of it is mispronounced as the actors cannot be expected to learn the pronunciation of transliteration when Egyptologists themselves don’t know how Egyptian was spoken. Basically what happened was the script writers gave an Egyptologist the lines they wanted the characters to say, then these were translated into Middle Egyptian complete with transliteration, the actors then learnt the transliteration. So they are speaking more or less correct Egyptian, just really badly.
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