The car Henry and Molly drive back in from Massachusetts is a 1963 Imperial Crown convertible built by Chrysler Corporation. Only 531 were made that model year. Base price was about $6,000 in 1963 (about $60,650 in 2024). An example in excellent condition in 2024 could be worth $150,000 or more.
The building shown as the "Cotton Mather Inn" is actually on MGM's lot, known as the "Girl's School", probably because it served that purpose for the films Forty Little Mothers (1940) and Three Daring Daughters (1948). The structure was notably used in Tea and Sympathy (1956) and The Cobweb (1955), where it was a psychiatric clinic.
Released on November 14, 1963, by MGM. It was the last movie released by a major studio before the assassination of John F. Kennedy on November 22, 1963.