If you show a pile of some bloodied Imperial armor, (or could just look like the helmets were smashed in) in a cutaway as they’re getting ready to cook Luke and company, that establishes that the Ewoks can be mean little buggers in large numbers. Han could be looking at it before he says “I got a bad feeling about this.”
This too.
Agreed. I think this would be a nice way of establishing that the Ewoks could be more credible in the later battles. Nice idea!