When Boris is disguised as a used car salesman, Natasha talks about listening to the radio and mentions "Myrt and Marge". "Myrt and Marge" was a daily radio showbiz soap opera that originally ran from 1931 to 1942, starring Myrtle Vail and her real-life daughter Donna Damerel (until her death in 1941 and replacement with Helen Mack). The show was revived, briefly, from 1946 to 1947 with Vail and Mack. In its heyday, the radio show was adapted as the film Myrt and Marge (1933) (featuring Ted Healy and the Three Stooges).
The fence at the pawnshop is named Andy Grift, a play on the name of TV and movie actor Andy Griffith.
In the "Peabody's Improbable History" segment, "Wellington at Waterloo", Peabody makes reference to paintings called "Whistler and His Dog" and "Blue Boy" while at the Louvre museum. James McNeill Whistler (1834-1903) was an American-born artist probably best remembered for the painting commonly known as "Whistler's Mother". "The Whistler and His Dog", however, is not a painting, but a musical composition by trombonist and bandleader Arthur Pryor (1869-1942). "The Blue Boy" (1779) is a famous portrait by British painter Thomas Gainsborough (1727-1788), but doesn't hang at the Louvre.