Outside of pitch, what else factors into foreign people haveing an accent?

Searching up how to improve ones accent will yeild only pitch-accent related discussions, and accent is obviously much more complicated than that.

What outside of pitch accent contributes to the generel accent developed by Japanese learners?

I know a little bit about devoicing, and how to correctly say certain characters like りられる、がぐげぐ which might not be as intuitive as they seem.

What else is noticed quickly? (generally)