1) Will Ferrell & James Caan

The cheerful vibes of Elf (2003) didn’t extend off-camera, as Will Ferrell and James Caan clashed frequently. Caan, a seasoned actor, was annoyed by Ferrell's improvisational antics, which he felt disrupted the set’s discipline. Meanwhile, Ferrell reportedly found Caan’s seriousness stifling. Caan later hinted that the tension made the experience unpleasant, and Ferrell, though usually lighthearted, chose not to revisit the topic.
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Edited by Priscillah Mueni