And just in case it needs repeating yet one more time: Inadvertent Narrative Intrusion. There is purposeful, well executed narrative intrusion as well. This thread is not about that. Purposeful narrative intrusion is wielding a blade with the expertise of a renowned swordsman. Inadvertent narrative intrusion is cutting your own hip when thoughtlessly sheathing that blade. In the first person, what you describe is not what I would think of as narrative intrusion. It might be something I consider unnecessary, info-dumpy, or boring to the flow of the story, but it's not a flavor of narrative intrusion with which I am familiar. Inadvertent narrative intrusion does have a number of forms. It's not just one thing. It can be: Everyone is a freakin' genious - Star Trek did this a lot. A lot - a lot! LOL It's a way to create unrealistic venues for agency. When house wives/hubbies down on Terra are all also plasma coil specialists or "Hey, I did my PhD in positronic brain programming, though since the kids came who has the time. Maybe I can fix Data with this house plant and a hair pin that I will rig into a neutrino stream caster", then... stupid. This character is my polemic voice - The author has a strong take on a topic and makes use of the voice of one of the characters as a mouthpiece. This character will info-dump at you for no apparent reason - The author does not trust that the reader will get what is being shown and has a character explain to the reader through dialogue. Characters may also spew bits, chunks, or reams of backstory in a completely unnatural way when in this mode. "Oh, yes. Like in the war of 537 where the Blargites and Flugites battled each other over the rights to the Flingenfloggen Valley, which, as you well know, is the precursor to the religious strife now affecting our people." Sheremahe sighed. "The Flingenfloggen Valley. I had forgotten about that. North of the Suscudio River and east of the Reebok Mountains. Yes. The ancestral homeland of our people before we migrated west into the Unknown Lands where we met the Merkata people who only befriended us for our gold and then turned against us once they had it. Damned Merkata. If only we had known better and stayed where we were, none of this would be happening." Largate smacked her thigh in frustration. This thought/opinion/observation belongs to no one - Most problematic in 3rd person limited. The 3rd person narrator will opine on matters, people, happenstance, in the story. The opinion thus expressed cannot rationally be attributed to any person in the scene. Older lit has this in gobs and buckets, but today it is thought of as a no-no. There may well be other forms and permutations and blends of the above, but just from what you describe in your post, that to me is not narrative intrusion. Other opinions may vary.