One scene takes place in a cafe called "Le Coin D'Enfer," which translates as "The Corner of Hell," a name the ABC censor would never have permitted in English. Incidentally, there actually is a restaurant with that name, but it's in Chemery-sur-Bar, which is about 150 miles from Paris. (It should be noted that, while the term "d'enfer" literally translates as "of hell," in French slang it is generally used as a superlative meaning fabulous or wonderful. Thus "Le Coin D'Enfer" means "The Wonderful Corner.")
The airplane that is shown as being the type that Stu flew to Paris is a Lockheed Constellation. The last Constellation was manufactured a year before this episode, in 1958. Lockheed didn't have another passenger plane until the introduction of the L-1011 Tri-Star three engine jet in 1972. The L-1011 was Lockheed's last venture into commercial aviation.