- Shortly before being addressed by Aragorn in The Two Towers, he is standing with another Rohan adolescent. That other part was play by Henry Mortensen, Viggo Mortensen's son.
- He and his mother Philippa Boyens have both been involved in Best Picture winners about a King. His mother wrote The Lord of the Rings: The Return of the King (2003), while Calum appeared in The King's Speech (2010).
- His voice in The Lord of the Rings: The Two Towers (2002) was dubbed by another actor because Calum's voice had changed during filming.
- Son of Paul Gittins & Philippa Boyens.
- Though he played the adolescent son of Hama in The Lord of the Rings: The Two Towers, in the book, Hama is much older, and has not only children, but a grandson as well.
- Brother of Phoebe Gittins. Older half-brother of Isaac Miller.
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