When the girls go to assault Miss Smith, one of them pulls down a curtain and its rod to use the cord to tie up another staff member in their dorm room. But, by the time the matron goes to question the girls, the curtain and the rod are back in place.
Claire misses the butler's head by a lot when she swings whatever the heavy object was, but he is knocked out anyways.
When Lucy opens the safe, there is no handle to retract the bolts - she just turns the dial a very little bit, then uses her fingertips to pull the door open. It appears the handle has been removed, or the safe is a badly-made studio creation.