Howling:The unexplained parts of "The Angels Take Manhattan"

So far as I can remember, two massive parts of the episode went completely unexplained: 94.72.194.203talk to me 19:55, September 29, 2012 (UTC)
 * How the Hell could Lady Liberty be an Angel when she's copper, pretty much hollow and was deconstructed in France then reconstructed in New York?
 * What happened to the Angel in the graveyard? Surely the Doctor didn't leave it?