The little cable assembly is for grabbing the hose end once it is forced through the tank grommet, that way the filter can be put on the end of the hose and dropped back in the tank.
The spring is a stronger throttle tension spring in the event you feel that the throttle response is too quick or if the original breaks someday.
The rest of the parts are future service spares to use as they are needed. Lots of carburetor are sold with spares these days to "sweeten the deal" for the potential buyer.