First of all, tracks are not connected together, this picture just shows the thermocouple wires and the thermocouple itself ..
Under no circumstances should you connect anything between the thermocouple leads and the input pins (1 and 14) .. no resistors, no capacitors, nothing ..
If you do, you will create another junction and this will affect the output voltage ..
If you need to decrease noises, try to shield the thermocouple wires (they shouldn't be longer than 500mm) or "play" with compensation capacitor connected between pins 10 and 9, 11 .. see figure.5 .. or add another LPF stage after the AD594 ..
Regards,
IanP