"Thanks everyone for your feedback. The technology behind Face Movie looks at the faces in your photos, then sorts your photos by the smoothest transitions between poses and facial expressions. It differs from the Movie Presentation feature by working to align or overlap the most similar faces on top of each other.
At Google, we love to launch new features, listen to your feedback, then iterate on our designs and improve them. So please keep your feedback coming! We're working to add additional controls to Face Movie, so stay tuned. In the meantime, please note the Movie Presentation feature supports sorting photos by date. The easiest way is to right-click your people album, select "Sort Album By Date," then click "Create Movie Presentation."