すずめの戸締まり
"On the other side of the door, was time in its entirety."
Suzume - Easter Eggs & Hidden Details
Easter Eggs
During a car ride scene with Serizawa, the song playing on the stereo is "Rūju no Dengon" ("Message in Rouge") by Yumi Arai.
This song is famously known as the opening theme for Studio Ghibli's 1989 film "Kiki's Delivery Service." Shinkai included this as a deliberate homage to Hayao Miyazaki and to ground Suzume's world in a reality shared by the audience, as most Japanese people would have seen and recognized the music from the classic film.
In the same scene where the "Kiki's Delivery Service" theme plays, a truck passes by with a logo of a black cat.
This is a multi-layered reference. The black cat is an obvious nod to Jiji, Kiki's feline companion in the Ghibli film. Furthermore, the logo belongs to the real-life Japanese shipping company Yamato Transport, whose logo is a black cat and who was a sponsor of "Kiki's Delivery Service."
Some viewers have noted that a woman seen traveling on a train in "Suzume" bears a resemblance to a character who also appeared in a train scene in "Your Name."
While not a major plot point, this could be a subtle visual cameo linking the worlds of Shinkai's films, suggesting a shared universe or simply a recurring character design that the director is fond of using.
The red ribbon that Suzume uses to tie her hair is visually similar to the red braided cord (kumihimo) that was a central motif in "Your Name."
This could be another subtle visual nod to Shinkai's previous work, linking the films thematically through a shared visual language of connection and fate.