I used to overpack a lot and sometimes even forgot vital pieces of clothing, such as my swimming shorts and sandals. I'm much better now. I only take what I know I'm going to wear or use and always double-check my suitcase so I don't have to rush to the nearest clothing store when I unpack at the hotel.
Sometimes I take the watch, or I take the shoes, but usually the souvenir is to take the life you had with those directors, or the crew - the camera person, the lighting person. When you finish a film it's like a little death. You had a family for a bit, and you finish the movie and you probably will never see each other again.