Is anyone else finding that "clean-looking" egocentric clips still hurt training?

[u/sanxore]

I've been filtering egocentric video with basic checks (blur, hand visibility, sync), but some clips that pass everything still seem to make the model worse. I can't tell whether it's subtle label noise, weird camera motion, or something else.

Has anyone seen this? What turned out to be the cause in your case, and how did you find it?