Only a noob myself, but I think the big circle on the left is the chassis ground, or the PCB ground plane, connection. All the other grounds are connecting back to this. The variable resistor leading to the base of the BC184 is the pre-settable type, I think, with the flat line on the wiper instead of the usual arrow. The other two that aren't wires (?) are a switch and an air-core inductor with 17 turns which is (again - I think) acting as a choke filtering out high frequency AC.