1)
To whom did they prostrate themselves?
1.
Moshav Zekenim (in Pasuk 6): Some prostrated themselves to Hashem, and some to the calf. 1
2.
Hadar Zekenim (in Pasuk 6): They prostrated themselves to the calf as a sign of Kavod, not in order to worship it.
1
Refer to 32:6:151:1-4.