1)
Why did they enter Beis Michah?
1.
Malbim (17): The opening to the Levi's house was via Michah's house.
2)
Why does it repeat that they took Pesel ha'Efod...? Verse 17 already said so!
1.
Radak: It is to explain the Levi's question (he asked why they took them).
2.
Malbim: The Levi saw that they were taking them to take them out of the house.
3)
Why does it say Pesel ha'Efod (Semichus, i.e. a compound noun)?
1.
Radak: Not every Pesel has an Efod. This one had an Efod.
4)
Why was his question "Mah Atem Osim"?