Some Discrepancies

[greatlit2003]

No: HPFGUIDX 86249

In the first book, when Harry looks into the Mirror of Erised and 
sees his family, he sees his parents and other ancestors, 
including "other pairs of green eyes" like his own. A few lines 
later, JKR writes that the *Potters* waved at Harry out of the 
mirror. The green eyes are a connection between Harry and his 
mother, and some of the people in the mirror are clearly members of 
the Evans family, so why don't the words reflect that? Did JKR have 
a reason for not telling us Harry's mother's maiden name until the 
fifth year?

Sirius's mother tells people to get out of the house of her fathers. 
We know that #12 Grimmauld Pl is "the noble and most ancient house 
of Black". So why does Sirius have his mother's maiden name? I know 
there is a lot of in-breeding in the WW, but still, why was Sirius 
raised in the house of his mother's ancestors? The Blacks seem like 
a traditional family, and in traditional cultures, women will take 
their husband's name, and live with the husband and his family. So, 
even if Ms. Black married a Mr. Black (thereby keeping her own 
name), why did she continue to live in her family's home? The only 
explanation I can think of is that the Blacks all lived together as 
an extended family. But if that was the case, why do they all live 
separately now?  Why didn't Lucius move in when he married Narcissa 
Black? The house was abandoned for years before the Order arrived. 
Surely Narcissa wouldn't have abandoned the old family manor she had 
grown up in?

greatlit2003