What did Hashem mean when He said "Peh El Peh Adaber Bo"?
Rashi #1 and Targum Yonasan: He meant that He specifically instructed Moshe to separate from his wife. 1
Rashi #2 (in Iyov, 4:12): This can be compared to a man who had a wife and a concubine. He came to his wife openly, but to his concubine, he came secretly. So too Hakadosh-Baruch-Hu, regarding the prophets of the Nochrim, the Torah describes how He appeared to Avimelech 2 and to Lavan 3 in a dream of the night; 4 Whereas by the Nevi'ei Yisrael, the Torah writes "Peh El Peh Adaber Bo."
Ramban: He meant that when He spoke with Moshe, He spoke with him mouth to mouth - and not in riddles.
Seforno: It means that Hashem spoke with him with the Name Hashem, whilst he was awake.
What was Hashem referring to when He said "u'Mar'eh ve'Lo v'Chidos"?
Seforno: Bearing in mind that the other prophets received their prophecies in the form of riddles 1 - Moshe' prophecies were given directly and did not require solving.
What is "u'Semunas Hashem Yabit" referring to?
Rashi and Ramban (in Pasuk 6, citing the Sifri): It is referring to when Moshe saw the back of Hashem's Tefilin. 1
Seforno: It repeats that all of the above advantages of Moshe's prophecy over that of the other prophets were added to the fact that he prophesied with the Name of Hashem.
Oros ha'Gra (p.292): Normally, Temunah is something outside intellect. Here, it means understanding Hashem's word.
Why does the Torah write "b'Avdi b'Moshe"?
Rashi: Hashem was pointing out to Aharon and Miriam that they would have had no right to speak of Moshe derogatively even if he had been an Eved Hashem who was not Moshe, or Moshe had he not been the Eved Hashem; 1 how much more so now that he was both.
Even had Hashem not designated Moshe to be His Eved, he would have been a very special person.
What did Hashem mean when He said "Madu'a Lo Yereisem..."? Why ought they to have been afraid to speak against Moshe?
Seforno: Refer to 12:8:6:1.
What is the significance of the fact that Moshe was Hashem's Eved in this context?