I dont know if this was allready touched on, but it seemed like John had only 4 toes, if you look at his "casted" foot in several scenes. The only scene that may have looked like five toes is when John is at Jacks hospital. Of course the gause or cast could be covering his pinky toe. Im not sure myself, just thought I would mention it.
When he shuffles to the table, you can only see 4 toes...but when he's standing on the edge of the table, you can see all 5.