Zevahim 37: Different Interpretations: Meaning and Reading

A new mishnah - starting chapter 4! A dispute between Beit Shammai and Beit Hillel: How many placements of blood on the altar are required for atonement? Beit Shammai says two places on the altar are necessary, while Beit Hillel says one placement is sufficient. Both of which depend on respective differences in reading verses from the Torah. Plus, what about leftover blood from previous offerings? And can sprinkling of the blood be done via pouring, or are they considered separate acts altogether? The different readings of the Torah's verses are understood to be based on words that are written differently than the way they are vocalized - specifically, "kranot" vs. "kranat" (meaning, corners or corner). With comparable examples from tefillin and sukkah.