1)
In light of Pasuk 14, what did Moshe mean when he said "ve" referring to?'Lo Itchem Levadchem ... "?
1.
Shevu'os, 19a: He meant that he was making them swear in accordance with the intentions of Hashem and in accordance with his intentions, 1 but not in accordance with their intentions.
1
See Torah Temimah, note 10, who elaborates.
2)
What about the Mitzvos that the Chachamim added later, such as Mikra Megilah?