Bump / Bubble under Display

Noticed a bump underneath my Alpha recently. You can only see it at an acute angle, and doesn't affect viewing the screen normally, but it's bugging me a little. Just curious is anyone else seeing the same?

Edit: seems similar to the defect found here
http://forums.androidcentral.com/sam...glass-pic.html

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Put call into bubble mode

When a new call comes in while you are in a different screen, it shows up as an unobtrusive bubble at the top of the screen, and stays that way until the call screen is expanded. How can I go back into that mode after expanding? Additionally, is it possible to do a split screen with the call screen (for example if I want to enter numbers onto the keypad from a webpage)?