Wore a poor garment while preparing for Shabbat, to show that one shouldn't consider one's own respect in preparing for Shabbat: Shabbat 119a
Rav Chanan and Rav Anan travelling on the road, and one saying to the other that they should ex-communicate a man who they saw violating a rabbinic prohibition; the other responded that they weren't expert enough in the laws to clarify the prohibition: Kiddushin 39a
Rav Anan sent a message to Rav Huna, calling him "our friend Huna הונא חברין"; Rav Huna was upset, and he sent a response with Rav Sheshet calling him "Anan" without an honourific and with implicit insult. Rav Anan complained to Mar Ukva - who justified Rav Huna's reaction: Ketuvot 69a
Cited a practice of Shemuel to prove a point: Eruvin 6b
Rav Anan said, "This is the way it was explained to me, by [Master] Shemuel": Eruvin 95a; Ketuvot 54a; Makkot 3b
Shemuel allowed use of a certain type of entranceway-structure to permit transportation within an alley. Rav Anan destroyed it after Shemuel's death, and Eivot bar Ihi, a resident, said, "I lived here until now under the ruling of Mar Shemuel, but now Rav Anan has knocked it down." [Rashi explains that Rav Anan did this because certain circumstances had changed.]: Eruvin 74a-b
Rav Nachman chastised him for not asking a question on one of Shemuel's teachings, saying "You must have been playing with chips!": Kiddushin 21b
Rav Anan's hunger when a mushroom dish was served at Shemuel's table: Ketuvot 61a