When Andy and Barney are leaving the McCabe house Andy pushes Barney into the car thru the driver's side door and the reflection of a boom mike can clearly be seen in the windshield.
Aunt Bee: Oh, dear, if I knew there was going to be a summit meeting in my kitchen, I would have washed the floor
This is the first and only time that Andy mentions how many bathrooms are in his house.
This marks the last appearance of Barney Fife in the series. Although Don Knotts would find marginal success as a film actor he typically portrayed characters very similar to Barney and was never fully able to be shake his image as the lovable, bungling sidekick.
This is the highest rated episode of the series.
Set during the height of the cold war (1945-1988), summit meetings between The United States and The Soviet Union were often considered vital to the deterrence of a nuclear war. These meetings allowed the two nations to make concessions and compromises that kept the peace. Aunt Bee's cooking could have very well have prevented a nuclear holocaust!