I thought it was very amusing when the pig got knocked over and the commentator said 'Someone call the vet!' I chuckled for a while, that is until everyone started falling off at the mushrooms- i nearly had to stop watching, ouch.
Nobody would have gone that side of the tree, had the back rail not been taken off (safety reason, due to weather conditions), jump should have been a corner. Thus the potential problem of the location of the pig, was probably not considered.