Magnum teases Higgins about a "kudu buck". This is a reference to episode 2.2 in which Magnum tries to hide a goat. Higgins hears it and is certain it is a type of wild African antelope with long curly horns named a kudu.
The title refers the feet positions used in ballet and the title refers to a fictitious six position.
In the opening ballet, Swan Lake, Odile and Odette are portrayed by two different ballerinas. While not unheard of, this is rare. The dual role of Odile and Odette is a prestige role in the story ballets and a test for any prima ballerina.
Andrea Marcovicci's (Kendall Chase) second appearance in the series. She first appeared as Amy Crane (aka Carol Foster) in Season 1 "Don't Say Goodbye" (1981).
The now destroyed North and South towers of the World Trade Center are visible at the beginning of the episode.