The park is on a hillside. I entered at the bottom and climbed up a lot of steps before I started taking pictures. At the top I realized people were watching something happeneing below us, so I looked over the edge of the wall and saw that I was standing above a film crew getting ready for a shoot. I don't know who it was or what they were filming, but I stayed to watch for a while. It was some kind of children's program or film.
You can see the rest of my pictures of this park and the shoot on this page. Parc de Belleville.