What is "No'alu"?
Rashi: It is an expression of Evilim (fools).
Radak: Nis'u (refer to 19:13:2:1); it is Nif'al. It is as if they were tricked, and lost their Chachmah.
What is the meaning of "Nis'u"?
Rashi: They were enticed, like "ha'Nachash Hishi'ani" (Bereishis 3:13) [Radak - like "Hashei Hisheisa" (Yirmeyah 4:10)].
Who made Egypt stray?
Radak: The officers and Chachamim. They assured them with their Chachmah that evil cannot come to them. They did not know the evil!
Malbim: The head officers. They should have guided the people. Rather, they made the commoners stray after folly, on an illusory path.
What is "Pinas Shevateha"?
Radak: It is the head of the kingdom.
Malbim: They are the head officers.