[3] By 2003, the Flat Stanley series had sold almost one million copies in the United States, and the stories had been translated into French, German, Spanish, Italian, Japanese, and Hebrew.

[2] Since Brown's death in 2003, other children's book authors, including Sara Pennypacker and Josh Greenhut, have continued the series under a new name, Flat Stanley's Worldwide Adventures.

[4] Books by other authors: The Flat Stanley Project began in 1995 under the direction of Dale Hubert, a third grade school teacher in London, Ontario, Canada.

The students at those schools are asked to treat the Flat Stanley as a visiting guest and add to the respective journal, then return them both after a short period of time.

[13] The Flat Stanley Project uses blogs for teachers, parents and students to publish stories, describe local traditions and scenery, and post photos.

The project was featured in the 2004 episode of the animated TV series King of the Hill How I Learned to Stop Worrying and Love the Alamo, in which Nancy Gribble receives a Flat Stanley in the mail.

Peggy Hill and Luanne Platter photograph it in a number of dangerous situations, resulting in the school's Flat Stanley Project being canceled.

According to the February 26, 2009 broadcast of Countdown with Keith Olbermann, Flat Stanley was on board the US Airways Flight 1549, which landed safely in the Hudson River.

A "Flat Stan" downloadable cutout figure was made available to encourage Cardinals fans to take photos with Musial's caricature and send them in as petitions.