While i was playing with decompressing movie sounds, i think i came across a few movies that the game doesn't use (well, at least i don't remember ever seeing them). I've taken the audio with a tweaked version of MGI2WAV, and put them below so you can hear them yourself:
http://student.dei.uc.pt/~mbrito/mgi/thatsthe.wav - "That's the kind of flying..." (Casey talks to Rachel after landing)
http://student.dei.uc.pt/~mbrito/mgi/eitheryou.wav - "Either you are... " (Casey talks to Rachel after landing)
http://student.dei.uc.pt/~mbrito/mgi/under.wav - Maestro and Stiletto: seems like an alternate scene to the one where Maestro says "You know Stiletto, i've noticed by the way you ignore me that you're extremely attracted to me."