Teeds has said pretty much everything about the subject and I just want to say that very good (and smart) riders will occasionaly lean towards the inside of the turn when it's doable and necessary.
Ryan Villopoto is a great example of that (especially on fast flat corner exits like the first pic) and I think it's very much one of the reasons of his success and great corner speed.
In real life as a spectator, I've also seen Chad Reed do that in supercross back in 2004. Pretty much the only rider of the field to do it, he crushed it and won all the races of the night.
Ryan Villopoto is a great example of that (especially on fast flat corner exits like the first pic) and I think it's very much one of the reasons of his success and great corner speed.
In real life as a spectator, I've also seen Chad Reed do that in supercross back in 2004. Pretty much the only rider of the field to do it, he crushed it and won all the races of the night.