- Cailean's first role was the lead for a short film, which he landed before he had taken any acting lessons or signed to an agent.
- When Cailean first started acting, he sported a Viking haircut, with a high ponytail and the rest shaved. He was interested in those historical periods and had hoped his look might get him auditions for a Medieval or Viking role. It took him 18 months to grow it to the right length. Ironically, the first role he was cast in was the lead for Maximus, a role which required his head to be completely shaven.
- Cailean's name is an old Scottish version of Colin, which is his dad's name. Cailean is pronounced 'Kay-len'.
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