For his role as Passepartout, Jackie had to have more hair extensions installed. This is a long process which is very uncomfortable. Have a look (click on an image to make it bigger):

Here's what Jackie had to say in his Around the World in 80 Days set diary (March 8th):

Today I had to get hair extensions put in. “Oh my god,” I thought to myself. This is the third time I’ve had to do this for a film. I knew I was in for some pain. The director wanted me to look different from my last film, so my hair was going to either be very long or very short. The extensions they put in were very long, almost down to my butt. Carol who is from England and also did my extensions for “Shanghai Knights,” spent six hours putting them in my hair. I tried to distract myself with magazines and the television, but it didn’t work.