There are two specific scenes I'm thinking of where angel statues inexplicably appear in strange places.
The first is when Sally Sparrow is in the police depot and looks out the window and sees angel statues on the church across the street. When she looks again, they are gone.
The second scene is when the officer is in the basement with all the cars. Sally leaves, and when he turns around, the room is full of angel statues.
You can view the two scenes here;
Can anybody explain these two scenes within the rules imposed by the episode?