1. The Gemara initially understands that there is a dispute about whether one may bake thick Matzah on Pesach.
2. The Gemara concludes that the dispute actually is about whether one may bake many Matzos at the same time on any Yom Tov.
3. One may not bake Matzos with designs on Pesach.
4. One may fulfill the Mitzvah of Matzah with Matzah Heina.
5. There is a dispute about whether dough of Ma'aser Sheni is obligated in Chalah.
A BIT MORE
1. Beis Shamai: One may not do so because it easily can become Chametz. Beis Hillel: One may bake Matzah that is less than a Tefach thick.
2. Beis Shamai: One may not bake many loaves at once on Yom Tov, because so many loaves are not necessary for Yom Tov. Baking them is considered excessive effort on Yom Tov. Beis Hillel: One may bake many loaves, and there is nothing wrong with the excessive effort involved as long as some of it is needed for Yom Tov.
3. This is because the bakers may take a long time to perfect the designs, possibly causing the Matzah to become Chametz.
4. Matzah Heina is Matzah that is not fully baked, but it is baked enough such that when one breaks off a piece, no strings of dough follow the piece. (This is the minimum amount of baking that ensures that the loaf is not Chametz.)
5. Rebbi Meir: It is not, because Ma'aser Sheni is deemed to belong to Hashem, and the requirement of Chalah is only from "your dough." Chachamim: Ma'aser Sheni is obligated in Chalah because it is deemed to belong to man.