The recording used in the trailer that is attributed to Stanley Searles ("I love you.") is thought to be the "ghostly" voice of Searles himself, a former politician who died in 2002. The recording was said to have been made by Searles' daughter, a well-known EVP researcher named Karen Mossey.
Approximately one second before the WHITE NOISE title card appears [00:01:35 in], there is a split-second subliminal "flash" image of a skeletal figure. Immediately after the final blackout at the end of the film there is another "flash" image, this time (presumably) of Michael Keaton, which fades into the static.
The EVP recording from the trailer ("I will see you no more.") that is attributed to a woman named Ruth Baxter who died in 1987, is supposedly a recording from Point Lookout, a "haunted" lighthouse in Maryland, made by an EVP researcher named Sarah Estep. The lighthouse was used as a hospital during the Civil War and some interpretations of the recording believe it to say, "I was seeing the war," or "I was seeing the water." While the recording is said to be authentic by the AAEVP, the Ruth Baxter story is fiction.