[Guekko]

The firefly message in Monsaic Lines on the PS1 does indeed say 'Leap of Faith', and I will pull out my copy of Abe's Oddysee in a minute to double check that. However, I perfectly recall it saying Leap of Faith.
Never had any troubles with cutscenes on the PS1, except for one that jumps, however that is probably due to it being a second hand ans slightly scratched disk

EDIT: It does indeed say 'Leap of Faith' in Monsaic Lines. It says it one word at a time though so you have to keep chanting to hear the whole message

I've only played the PC version of Abe's Exoddus, but not much of it, so the only differences I have gone through so far are the different looking levers, the different sound for the secret areas and the fact I cannot become invincible for casual runthroughs.