In describing their honeymoon program to B'Elanna, set in 1920's Chicago, Tom mentions they would "dance the Charleston in a genuine speakeasy called the Green Mill." The Green Mill is an actual night club in Chicago that still exists as of 2017, with much of its original decor still intact. It is known for featuring jazz artists and "poetry slams," and there are stories of Al Capone and his mafia men frequenting the club in the 1920s, as well as using the basement for their illegal activities.
This is one of the rare episodes of the entire Star Trek franchise which don't feature any credited guest stars, with the credits proceeding straight into the production staff after the opening titles.
This is one of two episodes when Ensign Kim is Captain. The other is the seventh season episode "Nightingale"
This takes place in 2375.