Bingowings said:

The lizard thing could talk like Mr Ed.

Baby Luke and Leia could talk like Mark and Carrie (e.g when Obi-Wan hand baby Luke over to Beru and Owen he could say, "This just isn't fair!"... that sort of thing).

I like that idea. Or maybe have it be their thoughts, similar to Look Who's Talking. That might give more freedom to place the dialogue anywhere.

Lines that might be useful:

"I have a bad feeling about this."

"YOU fought in the clone wars?"

"There's nothing for me here now ('now' could be removed).

Perhaps as Obi Wan is riding up to the Lars home, Luke could be heard crying, followed by Obi Wan yelling "COME TO YOUR SENSES!" Then after he hands Luke over to Beru, Luke would think "boy, am I glad to see you!"

Just a few ideas.