So I've been trying to articulate this concept in a concise way to several people I'm beta reading for:

It's very distracting and annoying to the reader when you mention background details that are really out of place or fascinating, but then are never explored or explained.

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Does anyone know what this is called?

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I was listening to one of Brandon Sanderson's lectures and I think he made the analogy where you show someone a video of a man walking across town and then in the background you can see a gorilla just hanging out in a phonebooth for a couple of seconds. Suddenly we don't care about anything this man is saying or what's going on in his life; there's a bloody silverback giving his mum a ring, what the hell is going on there?

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I can't really find much mention of this idea by that name anywhere, and I'm wondering if people have heard of it by another name or analogy, thanks.