Dead Silence (2007)
Crew or equipment visible
Correction: this shouldn't be seen as a goof. Ventriloquists can 'throw their voice', (make their voice sound as if it's coming from somewhere else). It would be easy for Ella Ashen to project her voice and make it seem as if it were coming from upstairs. Additionally, this ability is explained in the movie when Mary Shaw is able to throw Billy's voice into the house of the theater when she is looking for him at the beginning of her act in the flashback scene.