Jedikev - Everyone in the theater I was in laughed at Yoda throwing the red guards aswell. Personally, I thought it was a little dumb, but not anything dumb enough to ruin an entire movie... Like Jar Jar in TPM.
Also, Luke, both those plotholes have already been talked about in severel topics, along with some others.
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Also, I saw nothing wrong with the Lizard. I mean, I didn't think it was cool, but it didn't strike me as something to complain about really. You're suppose to focus on the battle and unfolding plot that's going on, and not just think about the lizard. I mean, with or without the lizard, the scene would've been the same.