aparently on Taris he has another moment like back on Balmorra and stops your target escaping through the back door... I'm assuming you have to have someone else with you for that to happen...
Hmm, how can I answer without spoiling too much... let's say you won't miss that scene no matter what you do. Just like the one on Balmorra, it's totally part of your story and will happen anyway (just like the "incident"
The examples I listed from Hoth and Corellia are exceptions, for all other interesting scenes you need to have Quinn with you all the time .
Other than that, it's more about choosing the right option in the conversation to get the most interesting answer, and I can only advise press the ESC key a lot and try out every option if you can.
Speaking about Taris, there is a moment when you are typing a code to open a door, and you really need to choose the right option in the conversation... won't tell you more not to spoil it for you .
On Tatooine, there is a conversation with one of your main quest NPCs where you can get -41 affection with Quinn but get a glimpse on his true feelings for you. (at 21:11 in the video if you missed it).
Just tell me where your character is and what she's doing right now and I'll tell you if there is something interesting to look for