In the scene where Ben falls off the climbers after having a "sword" fight, he cuts the top part of his leg. But, when he was in the hospital, the bandage was around his calf... did he cut himself twice?
I think it's definatly possible that he cut himself in more then one place. The cut with the "sword" was done on the top of his leg, right? I think that's correct. When he fell he could have cut his calf on the ceder junk they have there for the childrens "safety". Speaking of which, why do they have that ceder stuff in playground areas? Why not sand? That ceder can be sharp, therefore dangerous.