Rabbi Zeira Suggested to Rabbi Asi, who agreed, that Rabbi Asi had not presented an answer because his speed in learning had led him to omit it: Shabbat 130b
Rav Asi, or possibly Rabbi Zeira, challenging Rabbi Asi and causing him to be "Silenced for about an hour": Kiddushin 39a
Rabbi Asi and Rabbi Chiyya Bar Abba labelled "dardiki [Children]" by Rabbi Yochanan, and chastised for speaking without knowledge: Shabbat 145b
Explaining to Rabbi Chiyya Bar Abba why the birds of Bavel were fatter than those of Israel: Shabbat 145b
Explaining to Rabbi Chiyya Bar Abba why the holidays of Israel were less joyful than those of Bavel: Shabbat 145b
Explaining to Rabbi Chiyya Bar Abba why the Torah Scholars of Israel were less visible than those of Bavel: Shabbat 145b
Explaining to Rabbi Chiyya Bar Abba why the non-Jews sweated more than the Jews: Shabbat 145b
Rabbi Asi challenged a statement of Rabbi Ami because he had spoken more stringently earlier; Rabbi Ami responded that the earlier statement was a stake to prevent error: Gittin 17a
Rabbi Asi rescinded a person's vow, simply by acquiring his affirmation that he no longer felt the emotion which had driven him to vow initially: Nedarim 21b
Rabbi Elazar didn't come to the study hall once, and he found Rabbi Asi and asked him what they had learned that day in the study hall: Eruvin 47a
Rabbi Elazar didn't come to the study hall due to illness, and he found Rabbi Asi and asked him what they had learned that day in the study hall: Bechorot 3a-b
Rabbi Chanina bar Yosef, Rabbi Chiyya bar Abba and Rabbi Asi were staying in an inn together and had a Halachic question; Rabbi Chanina bar Yosef gave a leniency, which Rabbi Asi opposed. Rabbi Chiyya bar Abba said, "Let us depend on the elder," which they did. They later asked Rabbi Yochanan, and he approved of their actions, to the amazement of the students in Neherdaa and of Rabbi Elazar: Eruvin 65b-66b