Nice catch, you are referring to the side profile shot yes? It's called lense distortion, look at any other picture of any other car shot the same way and you will see the same thing.
1999 Prelude SH / Pearl White /
2007 X3 Sport / Jet Black /
2010 X5 Sport / Sapphire Black /
2013 X5 M-Sport / M-Power / Alpine White /