2 mishnayot! 1 - When is a grain-offering disqualified? And how does that connect to the blood that is collected from the animal sacrifice? With parallels between the fistful taken from the grain and that blood that is collected. Plus, the factor of impurity - if and when some portion of the grain-offering is impure, the offering may or may not have been rendered invalid. 2 - The ingredients of the grain-offering would be gathered in a sacred vessel before taking the fistful, and then transferred to a second sacred vessel. But what if it wasn't put in that sacred vessel? Is the fistful still valid? (hint: it's a machloket). Also, the question of when in the burning of the fistful from the grain does the rest of the offering become permitted for eating by the kohanim? Another machloket: from the time it begins to burn or only after "most" of the fistful is burned. With a deeper dive into that second opinion.