Rav Papi happened to visit the home of Mar Shmuel [Shmuel was no longer alive then, he visited the family on Yom Tov], they brought him a porridge of crushed grain and he refused to eat.
Question: Perhaps it was made in a small pounder [which is permissible in Bavel, 067]?
Response: He saw that it was very finely ground.
Question: Perhaps it was ground before Yom Tov?
Response: Its peel was bright [it was evidently freshly peeled].
Another explanation: The house of Mar Shmuel is different because of the carelessness of slaves [it was a prosperous household and the laws of Eretz Yisroel (067) apply].
Mishnah:
One who is selecting peas on Yom Tov [to remove those which are unfit], Beis Shammai: He must choose what is edible [this is a shinui, usually what is unfit is selected], and eat it [it must be eaten right away; this is the procedure we follow on Shabbos].
Beis Hillel: He may select in the usual manner and he may gather it in his lap [he is not required to eat it immediately], with a funnel or a bowl, but he cannot pick with a board or a sieve [a slight shinui is required]. Rabban Gamliel: He may even float them in water and pick the dirt off the top.
Gemara:
Beraisa: Rabban [Shimon ben] Gamliel: This was said regarding a case where there are more edible peas, but when there are more which are inedible, everyone agrees that the edible should be picked [because it’s less work. According to Beis Hillel the criterion for Yom Tov is to select what is less work].
Challenge: When the majority is inedible, does anyone permit it [the whole mixture is muktzeh]?
Resolution: It means that while the inedible is the minority, it takes more work to select it [because the pieces are very fine, for example].