ratpack1961 said:

When Luke is upside down in the Wampa cave, and fails to reach for the lightsaber, I remember then hearing Obi Wan's voice instructing Luke to "use the Force". After hearing this, Luke then reaches out and tries to grab the saber using the force.

Anyone else hear of this bit of dialog in any of the released versions?

Well, now that you've said it I seem to remember that too, it's also like a hazy childhood memory. I just checked and it's in the novelization, which I've read as a kid, is it possible you remember it from there?