The sequence between the Dowager Countess and Isobel Crawley in regards to the flower show is exactly the same as a plotline from "Mrs. Miniver" between Mrs. Miniver and Lady Beldon. At the flower show, the Dowager Countess, who traditionally wins the top prize, sees her name written down for the Grantham Cup, but announces the prize winner as Mr. William Molesley. Lady Beldon announced Mr. Ballard, the gardener who grew the 'Mrs. Miniver Rose' as the first prize winner at the Gardening Competition in the film.
Robert's antique snuff box being discovered missing and deemed stolen is a tribute to the classic series in which Winifred's antique snuff box is discovered missing and deemed stolen.