Let characters talk before engaging (spoilers for season 2)
A thing that bugs me, and I've been guilty of this too in the past, is when people just rush in before letting a character finish talking. When it's during a choice, granted, you're paying more attention on what to pick rather than listening to any talking anyway, but this also refers to when you approach a character, and their dialogue being cut when you trigger the scene. Did anyone listen to John doing impersonations of Batman and Gordon on the roof? Absolute golden stuff!
When you find John at the funhouse in episode 4, he talks to himself (and to the Agents) about how this place was special to him and Harley, how the Agents rudely showed up uninvited, and his brief doubts on whether Bruce sent them. Pretty interesting, and could potentially help you decide on whether to trust him or not by the way he's acting.
In the vigilante ending, when Avesta is on the rooftops, you can hear her speaking to her mother, and part of the conversation is in Farsi, which is a language spoken in Iran. Honestly, I had no idea she spoke Farsi, but later found out she worked over there, so it makes sense. In the villain ending, she only says one word of Farsi, which is when the bomb is defused in the church.
My favourite one however is in the vigilante ending when Bruce dresses his wound, Joker will constantly bother Alfred with questions about Bruce, Alfred's accent and John's attempt at doing a British accent, and how'd he haunt Bruce if he died. I recorded the conversation and edited out the silence, so you're not waiting for them to speak. It's in 2 parts because I forgot a piece of the conversation.
Post your own favourite moments.