As the two cousins head to the store in a Studebaker convertible the next overhead shot shots them pulling up in a Chevrolet convertible same color.
When Baltimore's Bromo-Seltzer clock tower is shown at the movie's opening, that 1914 depiction omits the brightly-lit 51-foot tall blue Bromo-Seltzer bottle that had adorned the top of the tower from 1911 through 1936. Descriptions from the time period report the blue glow could be seen from miles around. The oversight is particularly notable because the film's concurrent narration mentions the city's bright lights.
Although the beginning of the picture is set in the late 1940s, the Christmas song "Silver Bells" is heard on Jules' car radio, sung by Bing Crosby. That version of the song was released in 1950.