In this example, 25 frames are generated using Stable Diffusion, then frames are interpolated using FILM-Net. I hadn't see FILM-net before, it looks really neat.
Very impressive for the time.
From what I can see, they later revamped PhotoSynth to include actual 3d mesh reconstruction in 2014.
In morphing you end up with a blury mess for the between frames. This technique tracks individual features (eg eyes) and keeps them coherent.