Awesome edit, Laser! I think you should remove the "oh shit" line.

As I said before, when Spalko lands on the back of the duck while Marion's driving, they just stare at each other for a good 3 seconds. It just looks weird. Maybe a shorter cut is in order?

For the Waterfall edit, I urge you to consider this:

Marion's "Trust me!" line sounds really annoying, and I'm sure I'm not the only one who feels this way. Maybe her being silent while pushing Indy away would make her seem as a bit of a stronger character? You could mask her moving mouth with a closed mouth in your editing program, maybe? Anything to remove that line.

Here's the scene written out so it's clear:

Indy: Honey, slow down, you're gonna go off the cliff.

Marion: That's the idea!

Indy: Bad idea, give me the wheel!

[Marion silently pushes Indy back, and her foot hits the pedal. Everyone screams as they go off the cliff.]