Lynch originally wanted Hopper's character, Frank, to inhale helium and then proceed to speak in high pitched, comical, cartoon voice. However, whether Hopper felt it wasn't necessary for the character or had his own personal disconcert, Hopper decided against it. But in the movie, I believe it's suppose to be a sort of gas to make Frank high; maybe nitrous oxide. This gives Frank a way to always be high and have a disconnect from the world and thus allowing him to be numb and a callous villain.
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The cast of Blue Velvet on Blue Velvet - 2010 includes: Stephen Crompton
"Blue Velvet" by Spit
Brenda Lee
"Blue movie" is an old term for what would now be considered anything from relatively mild R-rated to full-out XXX-rated. As for names, unless you have reason to think that some specific kind of movie is desired, pretty much any 'adult film' from about the early 1950s back to the early 1920s should do.
The singer that is commonly referred to as Ol Blue Eyes is Frank Sinatra. He was a famous singer, actor, and also a director.