Colin Male (who is also the announcer speaking the principles' names in the opening credits) is listed in the end credits as playing "Wormser", but in the episode he introduces himself by saying "My name's Peterson. I'm the Game Warden in this district."
Barney tells Andy, on the phone, that Goober left the courthouse about 10 minutes ago and should be at Helen's "any minute". There's no place in Mayberry that takes 10 minutes to drive to.