1)
Why does it say "u'Mispar Chutzos Yerushalayim"?
1.
Malbim: Just like every city in Yehudah had its special idolatry, also each neighborhood in Yerushalayim.
2)
Why does it say "Mizbechos la'Boshes Mizbechos Lekater la'Ba'al"?
1.
Malbim: There were two kinds of idolatry. Ba'al was the form of a male, and Boshes was the form of a female. Her Boshes and Ervah were exposed; this was its Avodah.