1)
Why did he say "Neimar" (plural)?
1.
Ibn Ezra: I and the Chochmah can interpret it.
2)
Why did he say "Kadam Malka"?
1.
Malbim: The dream he said in front of all the king's servants. The Perush predicts the ceasing of Nebuchadnetzar's kingship. This was said only to the king.


