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1. The Gemara explains why the chapter begins with the words, "Klal Gadol."
2. The Gemara initially understands Rav and Shmuel as saying that the Mishnah is discussing only a case of a child raised without any knowledge about Shabbos.
3. The Gemara concludes that Rav and Shmuel agree that the Mishnah includes a person who knew about and somehow forgot the concept of Shabbos.
4. This argument (#3) seems to be an argument between Rebbi Akiva and Munbaz.
5. The Gemara explains the reasoning of Munbaz and Rebbi Akiva.
A BIT MORE
1. This Mishnah here, as well as the Mishnah in Shevi'is (ch. 7), begins with these words in order to teach that a certain category is more inclusive than another category. Bar Kapara argues and asserts that this phrase is used to emphasize that this subject has a stricter punishment than another subject.
2. This would imply that a person who knew about, but somehow forgot, the concept of Shabbos would be liable to bring a Korban Chatas for each Shabbos that he did not observe.
3. Rebbi Yochanan and Reish Lakish: If a child was raised with no knowledge of Shabbos whatsoever, he would be entirely exempt from bringing a Korban Chatas for any desecration of Shabbos (that he committed before he learned about Shabbos and its laws).
4. Rebbi Yochanan and Reish Lakish agree with Munbaz. Rav and Shmuel apparently agree with Rebbi Akiva.
5. Munbaz compares the verses discussing sinning unintentionally and sinning intentionally. Just as one who sinned intentionally originally knew it was forbidden ("when he sinned," see Daf 69, #1 below), so, too, one who sinned unintentionally must have originally known it was forbidden.
Next Daf Index to Revach for Maseches Shabbos