Given the importance of Christian's white shoes in the pilot as well as the shoes that Jack put on Locke in the coffin, I felt it necessary to mention this observation.
In the very first locke-centric episode, the one where we discover his former handicapped status. Just after the crash, Locke has no shoes on... He has to put on his shoes... Important? Maybe, maybe not...
Sure it could be that the show-makers needed us to see him wiggle his toes and with shoes, that might be tough... At the same time, it could be that is what they want us to think...