What is the difference between "Saru'a" and "Kalut"?
Rashbam: "Kalut" means that 'its hoofs are closed'.
Targum Onkelos: "Saru'a" means that it has an extra limb, and "Kalut"is missing a limb.
Targum Yonasan: "Saru'a" means that it has an extra kidney, and "Kalut", that it is missing a kidney. 3
What do "Nedavah" and "Neder", respectively, mean in this Pasuk?
Ramban, Moshav Zekenim: Neder is when a person says 'Harei Alai'; Nedavah is when he says 'Harei Zeh'. Both of these are permitted for Bedek ha'Bayis, [but on the Mizbe'ach] Lo Yeratzeh.
Which are not subject to the P'sul of Ba'al-Mum.
Ramban: Perhaps it is because the majority of Nedavos are donated to Bedek ha'Bayis - See Shemos 35:5 and Divrei ha'Yamim 1, 10:17, and the majority of Nedarim for Kodshei Mizbe'ach - See Tehilim, 116:17, 18:19 (See Ramban, who elaborates). In any event, the reason that Neder here refers to Kodhsei Mizbe'ach, Rashi explains, is because the Torah adds the words "Lo Yeratzeh", and it is Kodshei Mizbe'ach that come to appease.
Why does the Pasuk see fit to permit donating Ba'alei-Mumin to Bedek ha'Bayis?
Seforno: Because we would otherwise have thought that, since the above-mentioned blemishes are blatantly visible, it is not fitting to donate them even to Bedek ha'Bayis. 1
Seeing as, when all's said and done, it is for the needs of the Beis-ha'Mikdash. The Torah therefore teaches us that, since they are only Kadosh Kedushas Damim, which are sold and go out to Chulin, it doesn't matter.
R. Shimon says that a Kalut calf born from a cow is forbidden to people. If so, we do not need a verse to forbid it for a Korban!
Riva citing R"M of Kutzi: It is taught due to "Nedavah Ta'aseh Oso." One might have thought that it is forbidden even for Bedek ha'Bayis.