It's quite interesting to see two people mentioning the "hard to hit" UI elements... I have big fingers and so far no issues, but your messages show that there might indeed be an issue.
Not displaying the google address on the chat button is... Again a design decision :-/ A workaround is to go to the "unmerge" view, there you should see the IDs. The rational was that you usually identify people by their name, not their google id :-p