Ben and his unusual sister Saoirse, are sent to Dublin to live with their grandmother after they lose their mother. Will they reach Dublin safely as they are bound to encounter some vicious and mythical demons along their way?
Ben lives in a lighthouse with his father and mother, who enchant him with tales of selkies who transform from seals into humans. His happiness is disrupted when she passes away in childbirth leaving behind an unusual little sister, Saoirse, who remains speechless until her sixth birthday. Their father, still grieving, sends them to Dublin to live with their grandmother, separating Saoirse from the ocean that is her life-force and Ben from his beloved hound, Cú. They set off home on a perilous journey encountering mythical demons along the way
The ferry is named Ceol na Mara, which means "Music (or Song) of the Sea" in Irish
Brendan Gleeson voices Conor, the father of the main characters Ben and Saoirse. In Cartoon Saloon's previous animated film 'The Secret of Kells', Gleeson voiced Abbot Cellach, the father figure of the main character Brendan
Pat Shortt, the voice of Lug, guest starred on an episode of Moone Boy with David Rawle, the voice of Ben. Coincidently both set of characters met each other on Halloween day
An animated version of director Tomm Moore can be briefly seen in the background during the scene where Ben and Saoirse walk past the statue of Molly Malone
The pub that Conor visits is called Ó Mórdha, the Irish version of the surname of director Tomm Moore
There is a hidden reference in the license plate of the grandmother. Here, the Danish letter Ø [oe] is used
The drawings in Ben's book are drawn by Julian Erlinghauser, the assistant director Fabian Erlinghauser's son
The film is set in October of 1987, which Moore remembered as rainy, and windy. Some characters also relate to Moore's family and pets from memories, pictures, etc
According to the commentary, director Tomm Moore states that the film is based of several aspects from his childhood
One of the trick-or-treaters on the bus is holding a turnip Jack-o'-lantern. Original Celtic Halloween celebrations carved the lanterns out of turnips and various other root vegetables
There were four studios involved in creating this film: in Ireland (Cartoon Saloon is based in Kilkenny), Denmark, Belgium, and Luxembourg
The character Aisling from 'The Secret of Kells (2009)' can be seen aboard the bus that Ben and Saoirse ride
'Saoirse' means 'freedom' in Irish. Her mother's name, 'Bronach', means 'sorrowful'
When Saoirse is following the glowing particles up the lighthouse staircase after blowing on the shell, her shadow appears to be that of a seal rather than a human
The few lines at the very beginning of the movie are from "The Stolen Child" by Irish poet William Butler Yeats, who was also a driving force behind the Irish Literary Reviva
In one of the scenes where Saoirse and Ben are walking in the city, a close-up of the iconic statue of Molly Malone can be seen briefly, thus it could be inferred that they're walking in the streets of Dublin, Ireland
'Cú' literally means "dog or hound" in Irish Gaelic, while more specifically he is an Old English Sheepdog
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