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1. If one adds up the Torah's count of Leviyim from Gershon, Kehas, and Merari, he will find a total of 300 more Leviyim than the number listed as the total number of Leviyim.
2. The Maneh used for holy purposes was more than double a regular Maneh.
3. Rebbi Eliezer explains why there is a Mitzvah to redeem a firstborn donkey, but not to redeem a firstborn horse or camel.
4. There is an argument about the significance of the names "Refidim" and "Shitim."
5. One is obligated to redeem a firstborn donkey only if the firstborn donkey and its mother look like donkeys.
6. A firstborn animal that does not look at all like its mother is exempt from the laws of Bechor.
7. Whatever comes from a Kosher animal is Kosher, and whatever comes out of a non-Kosher animal is not Kosher.
8. Rebbi Yosi ha'Glili disagrees about the source of laws #5 and #6 stated above.
A BIT MORE
1. This is because 300 Leviyim were firstborns who were considered to redeem themselves, while the other 22,000 redeemed the firstborns from Bnei Yisrael.
2. The amount of silver collected for the Mishkan apparently was about twice the amount used in the building of the Mishkan. This discrepancy is reconciled by realizing that the Maneh was actually twice as big for holy purposes such as for the building of the Mishkan.
3. Besides the fact that this is the decree of Hashem (see Maharsha), Rebbi Eliezer adds that every Jew had at least 90 donkeys to carry his gold and silver out of Egypt.
4. Rebbi Eliezer says that these were merely the names of places. Rebbi Yehoshua says that "Refidim" indicates that this is where they weakened their grip on the Torah, and that "Shitim" indicates that this was where they dealt in frivolity (i.e., they were promiscuous with the women of Moav).
5. This is derived from the fact that the Torah states "Peter Chamor" twice, indicating that both the offspring and its mother must look like donkeys.
6. The Mishnah applies the teaching about redeeming the firstborn donkey (in #5 above) to Bechor.
7. For example, a camel (i.e., what looks like a camel) born from a cow is Kosher, while a cow born from a camel is not.
8. He explains that the teaching is derived from the verse "Bechor" stated by an ox, sheep, and goat, indicating that both it and its firstborn must look the same. The law that a firstborn donkey and its mother must look the same is derived from the derivation regarding Bechor.
Next Daf Index to Revach for Maseches Bechoros