Frame rate was slow when filmed. Looks about right if you slow it down to 50% in youtube. Maybe somebody could run it through some interpolation software...
look, how every house is beige and changes color. I sincerely enjoy the bw-version much more.
Colorization is far from perfect indeed. I'm not sure how they model the temporal dimension (recognizing the same object in the prev/next frame and painting it of the same color - unless it has to be different because of shadows, lighting change, etc.) in these neural nets, does anyone know?
I wish publishing pre-sound era films in their original framerate was a common practice. However, for some reason it seems to be beyond the scope of people handling these restorations.
I think its about the video at bottom of the page. This one is slowed down.