If you shake crumbs or dust, etc., off your tallit, or garment, that's akin to laundering, and incurs a korban chatat, at least for a new garment. And yet, this was not a universal approach - as some people were not concerned about it, and for them, shaking off the dust, crumbs, etc. did not matter, and therefore did not incur a korban chatat. Ulla, the key personality here, does seem to like to get involved, as he fears that those who were not particular about their garments in this way were violating Shabbat! They reassure him. Also: R. Yehudah HaNasi wore his tallit piled on his shoulders - wouldn't Rabbi Meir (son-in-law of R. Chananyah Ben Tradyon) obligate him in a korban? Or was it R. Akiva's son-in-law, citing R. Akiva? It seems that R. Yehudah HaNasi has an open ear to other's comments. Also, a new mishnah: If you bathe (or go swimming on Shabbat) in the waters of the hot springs of Tiberias, the case of one person drying off with 10 towels vs. 10 people drying off with one towel, and veering into the prohibition of squeezing on Shabbat. And other interesting tidbits here, including the notion that making yourself throw up is a problem of bal taschit. Note: The halakhot on this daf seem to contradict our current practices. Plus: an indictment of wine and bathhouses as a path to forgetting Torah, and the claim that such pleasures are how we (ahistorically) lost the 10 Tribes. The sages were clearly concerned with assimilation and the harm it was causing the Jewish people - how modern of them.