The plaque denoting the Douglases' house as a historic monument was hidden by a shutter. Mr. Haney did this when he owned the house so he wouldn't be mobbed by tourists.
According to Haney, Hooterville is located in the state named after Rutherford B. Skrug, the state's first Governor. The name was changed shortly after he became president of what would become known as the United States.
Lisa makes a rare threat to Oliver. Instead of threatening to move back to New York City, Lisa threatens to move back to Europe.
After Alf and Ralph walk off the job, Lisa makes a comment that an Austrian man of that kind of job would never do that. In fact, in Austria, it is illegal for a Blue-Collar worker to walk off the job. If he does, he will not have a job to come back to, because, in Austria, men who are Blue-Collar workers are highly-prized.
Eb mentions Hoot Gibson, who is best remembered as a star of cowboy movies from the silent and early talkies era.