Makos 2a.
1. We mentioned Tosfos’s question why the Mishna (citing two exceptions to the “hazomo rule”) does not use a case of a mamzer which in theory pertains to everyone as opposed to a Gerusha Vachalutza that is limited to Kohanim.
2. In discussing if Makos is a separate tractate or combined with Sanhedrin, we spoke of the two different orders of the Mishnayos, either Zema”n Noka”t or Neze”m Koto”n. Attached is the Sicah of the Rebbe regarding the Mitzva Tanks where he explained that the work ‘tank’ (same letters as “Noka”t) is symbolic with three ‘sedorim’ in Mishnayos and how one who goes on a ‘tank’ needs to follow the order to be successful.
The original Sicha was 12 Tamuz 5734.
3. Tosfos in Yevomos (88a, V. Oso Gavra) if two witnesses say that a person is dead, even if he shows up at a later date, he is or may be considered dead, or we must say that it is not him!
4. Ramaban’s logical reason why you believe the second set of witnesses because the first set turns into defendants.
5. Yaakov Emden’s (Yavet”z) , (great-grandfather of NY Senator Jacob Javits) relates a fascinating story that occurred with his grandfather Reb Yakov. During a pogrom where many Jews were beheaded, his grandfather was next on line to be killed. At the last moment he was miraculously saved from execution but fell into the pit where those before him were killed. People who witnessed the entire saga testified at the Beis Din of the famous Reb Heshel of Cracow (teacher of the Sha”ch) that they saw him beheaded. Despite his ruling that Reb Yakov’s wife can remarry, she refused to do so. Sure enough Reb Yakov reappeared. As a consequence of this story, Reb Heshel (the accepted ‘Rabbi’ of that time) refused to ever rule again on Agunos because of the mistake that was almost made.
Attached is a PDF with the story.
Regarding the actual book Megilas Sefer see Here. You can also buy the book in English Here.
Sicha of the Rebbe about Mitzva Tanks