This episode reveals that Andy and Barney graduated from Mayberry Union High in the class of 1945.
Barney Fife's yearbook indicates that his full name was Bernard Milton Fife. He had three middle names/initials throughout the course of the series. In "A Plaque for Mayberry," his middle name was Oliver. Throughout the series, after this episode, Barney was known as "Bernard P. Fife."
Real high school photographs of Andy Griffith and Don Knotts are utilized in the Mayberry Union High School yearbook. Griffith attended Mount Airy (North Carolina) High School while Knotts graduated from Morgantown (West Virginia) High School.
The reunion is for the class of '45, making the classmates about 36 when this aired in 1963. In real life, Andy Griffith was born in June, 1926 and Don Knotts in July, 1924, making them 36 and 38, respectively, when this aired.
Barney Fife's high school yearbook reveals that his full name is Bernard Milton Fife and he participated in the following activities: Board of Directors of the Tin Foil Drive, Hall Monitor, Volleyball Court Maintenance Crew and Spanish Club.