'Chetzyo' is specific. Why does it have the prefix Hei?
Radak: We find like this
Why does it say "El Mul"?
Radak: They were not on [top of] the mountains, rather, on the slope.
Where are Har Gerizim and Har Eival?
Radak, like R. Yehudah, Sotah 33ba: They are near Shechem.
Radak, like R. Elazar, Sotah 33b: They are close to the Jordan. 1
Why does it say "Levarech Es ha'Am Yisrael ba'Rishonah"?
Rashi (from Sotah 37a): This teaches that the Brachos are before the Kelalos.
Malbim: The Ibn Ezra (Devarim 27:14) holds that the Shevatim on Har Gerizim blessed, and the Leviyim cursed. It is as if it says 'Yisrael Levarech Es ha'Am ba'Rishonah.' 1 According to the [other] Meforshim, [that the Leviyim blessed and cursed], it is difficult why it says "ha'Am Yisrael."
This seems unlike the Trup, which reads ha'Am together with Yisrael. (PF)
What were the Brachos?
Rashi: They are inferred from the Kelalos, e.g. blessed is one who will not make an image.
Radak: They said the Brachos "v'Hayah Im Shamo'a
QUESTIONS ON RASHI
Rashi writes that the Brachos are before the Kelalos. In Bereishis (27:29), he writes that Yitzchak put the curse first (Orarecha Arur) and Bil'am put the Brachah first "Mevorchecha Varuch " (Bamidbar 24:9), because Tzadikim first suffer, and enjoy tranquility at the end. Bereishis Rabah (66:4) says that Yitzchak loved Yisrael, therefore he concluded with a Brachah, and oppositely, Bil'am concluded with a curse!