Emma Roberts worked with an on-set etiquette coach for the role.
Cameo: [Bruce Willis] the lead actor in the fifties crime film (Nancy Drew is mistaken for an extra in the film).
When Nancy is looking at the movies Dehlia Draycott had been in, several titles are names of Nancy Drew books.
When Nancy is searching for information on Dehlia Draycott, one of the websites she uses is IMDb.com.
Many of the threats in the movie are similar to the threats in some of the original books. For example, the bomb that was placed in Nancy's car, and Nancy and Corky nearly getting run over, and also the threatening phone call. The drawings at the end credits are also similar to the illustrations in the original books.
At the very start of the film, the camera closes in on a bookcase. All the books on that bookcase are Nancy Drew novels.