The structure and progression of the segment printed on 15b.

The first three Mishnayos (15b, 25a, 26a) are actually one structured Mishnah

The halachah of a KP shechted at the wrong time with the wrong intent, which seems like something of a curiosity, turns out to have major practical ramifications for the kashrus of normative Korban Pesach.

The tug of war between the Mishnah and the Tosefta about where to present the question of Korban Pesach shechted the morning of 14th Nisan shelo lishmo.

Factors taken into consideration by the Rishonim on how to pasken in a machlokes Tannaim.

A cryptic opinion of Yosi ben Choni is made sense of through a parallel discussion in Tosefta Pesachim.

The seemingly superfluous "כחטאת כאשם" becomes the basis of a major machlokes between R. Eliezer and the Chachamim

A bird's-eye Overview of the order of business for these next three blatt

The Chafetz Chaim's rearrangement of the Sugya

Pondering the sharp digression from shelo lishma to general kapparah issues