On the "hilazon," the crustacean whose blood is used to make the tekhelet: the murex trunculus, and its form, function, and impact. Also, the Gemara tells the story of a sage who was particularly careful about the mitzvah of tzitzit, and, indeed, they end up protecting him from sin (and then in reward for his resolve to not sin, he is given the very opportunity that was prohibited - but now permitted for him). Also, 2 mishnayot! 1 - Non-essential libations with regard to each other. But what about the grain-offering itself? 2 - The bull, the ram, and the lamb of the Musaf offerings - are not essential for each of the others to be accepted.