Hachiman decides to drive away Yukino by intimidating her. While his reason is more or less sensible, his method consisted of staring at her and growling. For added comic effect, Hachiman cowered after just one Death Glare from Yukino.
Yukino delivers a speech for Yui about skills, talents and hardwork. Yui's response "you're so cool!" caught Yukino off guard so much it left her slack-jawed.
Episode 2, Yukino provides constructive (albeit rather harsh) criticism of Zaimokuza's light novel. The latter is completely crushed and tries to seek some consolation from Hachiman.
Zaimokuza: "Hachiman, you can understand me, right?"
Episode 8: Yukino's A-Cup Angst being thoroughly commented upon by practically everyone.
Episode 9: Hachiman uses a phone app on Yui's dog to decode its bark. He constantly gets "Let's go play!" and starts wondering if his app is broken. Then he tries barking himself and gets "I don't want to work, master!"
Komachi: "It's your head that's broken, Bro."
Elaborated further in Volume 5: Hachiman then downloads a similar app to decode Kamakura's meowing and gets "Itchy. Tasty"