There’s a urban legend according to which Norma Desmond (Gloria Swanson) mentioned Caron Narcisse Noir in Billy Wilder’s Sunset Boulevard, thus scoring the first major product placement in cinema. You find this piece of news everywhere on Internet, basically in every single review of the perfume. Well, I’m sorry to disappoint you but this is what I said, nothing more than a urban legend.
Yesterday evening I took the time to watch the film for the nth time and there is no mention  to the Caron perfume. The only moment in which Joe Gillis (William Holden) comments on Norma’s perfume is from the movie-watching scene. “She’d sit very close to me, and she’s smell of tuberoses, which is not my favourite perfume, not by a long shot.” According to Fragrantica, tuberose can’t even be found in the olfactory pyramid of Narcisse Noir! Maybe the legend started from the fact that Swanson was said to have used this perfume on set, but there’s a big difference between saying she used it on set and saying it was mentioned in the film. I can’t rule out the possibility that a bottle of it was on the busy dressing table of the diva, but I couldn’t find it. Show me a screencap and we’ll discuss about it.
 If you check the movie script, you will obviously find no mention to Narcisse Noir.