Hank Kimball is using a duck call to go grouse hunting. Duck calls are only used to attract ducks.
Oliver, i.e. Eddie Albert, and Lisa, i.e. Eva Gabor, claim their house dates back to the (U.S.) Civil War. This makes their home over one hundred years old as this episode aired in 1970 and the Civil War was fought from 1861-1865.
Lisa, i.e. Eva Gabor, says Arnold likes to watch Walter Cronkite on the color television set. Walter Cronkite was the evening anchor for CBS Evening News with Walter Cronkite (1962).
Adjusted for inflation, the $45 Mr. Haney charges to change a flat tire for Haney Auto Club non-members would equal approximately $357 in the year 2023.
The far east war that Mort mentions would be the Vietnam War that was still raging in 1970, when this episode originally aired. For Vietnam, the war would continue at least five more years.