There are approximately 22 owls located throughout the film.
The film's director, Pearry Reginald Teo, is known for his work in the horror genre, including films like The Evil Inside and The Curse of the Sleeping Beauty. The Assent uniquely blends the themes of demonic possession with mental illness, creating an ambiguity that leaves viewers questioning the true nature of the events. The film employs distinct visual effects, such as a subtle red-and-blue, 3D-glasses-style look, to depict Joel's unsettling visions and hallucinations.