I'm going crazy trying to find the name of a movie from the 70's or 80's. These are the only parts I remember. It's a real movie, but with cartoon characters as well. The boy is real, and he sets out on an adventure with a cartoon buddy. I remember he drops his sandwich in a stream and it gets really soggy and gross, and he picks it up and eats it. There is a cartoon fairy or something flying around talking to him at certain parts. At the end there is a mountain that looks like a mountain but as a cartoon man is running up it, the mountain becomes a living creature and it's singing. I think there's a bad guy cartoon guy in black that steals the real boys treasure chest and finds out in the end it contains a stone, a marble, and a feather. Anyone?