Strange Display issues on Boot iPhone 4 (White Conversion)

So I successfully swapped the black for the white iPhone 4 front and back from the whiteiphone4now website. The only strange thing I've noticed is on powering up the device (after shutting it down). The first time I powered on after the conversion, the screen threw up a bunch of messages regarding my gmail account, etc. Then it seemed to be ok. I then powered down and powered back on. The second time, a few of my letters on the keyboard wouldn't work initially (when I was trying to type my iTunes password to update a fews). Eventually it started working again. Finally I just powered down and powered back up and everything appears to be working fine.

The random issues on the first two sessions concerned me Is it just something the happens when you replace some hardware? Anything that could be causing it that I should address? Maybe I am paranoid, but the random nature of it the first to cycles concerned me.

Thanks (in advance) for your help!