Meg Ryan ADV denotes an advance or teaser poster, usually without credits, issued before the movie is released in theaters. For many films, however, there is only one poster.
British quads are movie posters issued in the UK, and are displayed horizontally.
Quads are popular because they often feature different artwork from the U.S. poster. One sheets may or may not be printed on both sides. Reprints may be slightly smaller than original one sheets, but not always. British quads usually measure 30 x 40 inches. Reproductions are of a classic posters and are usually 26 x 38 inches or slightly smaller.