In a large bowl that has been sprayed with cooking spray, place popcorn, peanuts and gum drops; set aside. Lightly spray a bundt pan with cooking spray; set aside. Heat butter, corn syrup and brown sugar in a large saucepan over medium heat, stirring constantly. Bring mixture to a boil and cook, stirring constantly, 2 minutes. Remove from heat and stir in vanilla. Pour hot syrup over popcorn mixture and quickly stir to coat thoroughly. Add small candies and quickly stir just until evenly distributed. Spoon into bundt pan; gently pushing mixture into pan. Cover pan lightly and allow to cool at room temperature 4 hours or longer. Invert cake onto serving platter. Push lollipops into top of cake before serving.