As the series had several writers, there were occasional continuity errors, most frequently in Barney's middle name, which changed each time it was referenced. For example, both Barney and Andy are given different middle names in different episodes. In the episode "Class Reunion", Barney's middle name is Milton, though at other times he is called "Bernard P. Fife". In another episode, where he believes he is the descendant of Nathan Tibbs, a Mayberry Revolutionary hero, he says his name is "Barney Tibbs Fife". Andy jokingly says, "I thought your middle name was Oliver." Another inconsistency is Barney's military service in WWII, which is not easily reconciled with his having graduated high school in 1945.