When Mrs. Mandel waves a $50 bill at Berry-Berry, the bill turns upside down between the long shot and the close-up.
When Ralph asks Berry-Berry if he'd like to split a nightcap, Ralph's glass is about three-quarters full. After a cut to show Berry-Berry's quick refusal, the camera immediately returns to Ralph, whose glass is now less than a quarter full.
During the Christmas scene, there is a December 1961 calendar in the kitchen. A few months later when Berry-Berry visits for coffee, the calendar is from April 1961.
When Clinton goes downstairs for breakfast, there is a photo of Berry-Berry on top of his dresser in front of a model ship. When Clinton goes back to his bedroom, the photo is no longer there.
During the opening credits, Clinton gets off a bus and walks around some piers past boats afloat and boats in dry dock. However, some of the floating boats he walked past are also seen in dry dock during the same walk.
Just before Berry-Berry meets the schoolteacher character (Barbara Baxley) when he's working in the gas station, the radio station being broadcast identifies itself as beginning with the letter 'K.' All TV and radio stations East of the Mississippi have call letters that begin with the letter 'W.'
Berry-Berry is supposedly working at a gas station in or near Miami, Florida - according to the radio station he is listening to. However, he is working at a Richfield Oil Company gas station, which were located primarily in west coast states.
When Clinton meets Echo after the book club meeting in Cleveland, in the background is a huge plaque commemorating the "Fred W. Green Camp 120". This is the United Spanish War Veterans group in Culver City, California.