In the film the music box is the first connection made between Winnie and the Tucks, and its playing symbolizes both the allure of their immortality and also the longing Winnie still has for the familiar world of her home.
Mae Tuck uses the brooch to fasten her shawl. It is part of the early 20th century look of the film, which tried to capture a moment between the passing of the Edwardian era in fashion, with its broad hats for women and stiff collars for men, and the dawn of the Paris-influenced modernist style, with its clean lines and tubular silhouettes.
Angus Tuck uses the rowboat to take Winnie out on the lake near the Tucks' cabin. Its use emphasizes the point made by Angus that life should be freely flowing and changing rather than stuck in one place, as the Tucks are because of their immortality.
Winnie and Angus Tuck are seen together in a horse-drawn carriage, which evokes a sense of the 19th century past to which the Tucks are eternally bound. The scene is the occasion of Angus attempting to rescue a toad which, unknown to him, has been given immortality by Winnie.