This animation has much more colors in original and then i saved it in 16 colors. That dots where some forgotten grey pixels in frames, they became white after decreasing number of colors. And yes i fixed it manually.
Wait, how are the white dots caused? I had that problem in one of my animations and I had to fix it manually.
Yep, done. This is because of decreasing number of colors. Thanks for a your comment.
You should remove the white dots that appear throughout the animation.
Thank you!