The chimes on the doorbell to Joseph Cotten (Pat Martin)'s house play "How Dry I Am". Quite fitting considering Van Johnson (Donald)'s drinking problem and the "lushy" household guests that tempt him.
There is a town called Nogales in the US, near the Mexican border, and another called Nogales in Mexico. This can be slightly confusing at times, as the two men are in the American Nogales but Eric talks about having to go to Nogales (the Mexican one).