Yes, Instagram is just an aspect of the real attention competition and we each have our 1 to 3 seconds to impress and hold attention. It kills but this is how it also filters content.
I noticed almost nothing else, there was a tall girl in black T-shirt that I remember the haircut of, I noticed the motion and figures obstructing my vision from time to time. They may have swapped a person in black with another without me noticing that. Or something like that. It's typical for this kind of experiments.
I feel that the short attention paid leads to short attentional skills and in time, all content becomes consumable, including us and our relationships. Hold me now, because tomorrow I will be gone.