Exclaiming "Tameih Al Atzmicha! [Be Amazed at Yourself!]": Pesachim 23a, 28b
His town ate fowl with milk, in accordance with his ruling, against the majority view: Shabbat 130a
Rabbi Tarfon, Rabbi Yosi HaGelili, Rabbi Elazar ben Azaryah and Rabbi Akiva attempting to console Rabbi Yishmael on the loss of his sons: Moed Katan 28b
Rabbi Yosi haGelili once met Beruriah on the road, and asked her, "Which way is it to go to Lud?" She responded, "Foolish Galilean, didn't the sages say that you should not engage overly much in idle speech with a woman? You should have said, 'Where to Lud!'": Eruvin 53b
Rabbi Yosi haGelili's belief that Halachah may view two events as truly simultaneous [אפשר לצמצם], whether natural events (like birth of twin animals) or events engineered by human beings (like placing the horizontal חוט הסיקרא thread around the altar at the precise midpoint): Bechorot 9a, 17a-18a