Norman Irving's band were formerly known as the "Gunslingers", but later changed their name to the "Chrome Roses". Both of these names reference elements in the Dark Tower series.
One of Edgar's major works is "Roses Grow from Shells", and his ex-wife tattoos a rose onto her breast.
In The Langoliers, when the passengers in the plane are traveling back through the rip and experiencing the birth of the world, the pilot twice mentions that it feels like a beautiful rose slowly opening.
In "The Man in the Black Suit," the narrator recalls a strong memory of his mother standing in sunlight in their kitchen and wearing a dress with red roses on it.