"The footage is still on my phone," she announced, explaining how she used the device to capture a scene where a girl falls in a pond.
"We had to shoot some stuff underwater and the pond was actually too murky to really film, so we took a quarter of a swimming pool and we covered it with black wrap and the director of photography got in with my cell phone in a waterproof case and went underwater and the whole thing was shot on my phone."
"You can buy the case on Amazon for $119," Hart's mother Paula -- who is also her producing partner -- chimed in.
"Which is exactly what we did. Wait until you see. It looks incredible!"
"The Watcher in the Woods" is to debut on Lifetime Saturday night.
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