Ive noticed the power printed at the top left of the screen is wrong if you have less then 100k into whatever million you are at.

Example:

Lets say my power is 3,099,655.. When looking at my power from my city view that would be printed as 3.99m instead of 3.09m and then I gain more expecting to hit 4m but instead I get to 3.1m

On more than one occasion Ive been fooled by this into thinking I had gained or lost much more power than I should have. Its not something that really affects the game play overall but it is incorrect and should looked into, I have to assume it to be a simple fix.