back ground check education verification concern

I recently recieved a full time offer from a consulting firm pending a background check and have following concerns: 1) my major at time of application was Math and Finance but now I changed it to Statistics for my own personal reasons of keeping doors open for graduate school in stats and needed some prereqs. Will this come up in the back ground check? 2) My unofficial transcript was obviously not altered but my gpa works out to be 82.1, but on my resume its listed 83 because of a calculation mistake I made in computing the average based on the courses i had taken prior but were not reflected in my average until time of app. Is this a big deal?

I am kind of freaking out