I was already planning to do the popping of each menu button in a follow up post.
You're right about the menu appearing underneath the tweet. Luckily doing it that way is just as easy as having them animate together. I'll look at modifying the code to handle both animation styles.
The bounce is already implemented in the current code.
I agree with you that Tweetie's implementation is well thought out. The goal is to have a 100% faithful recreation that is indistinguishable from the original