The extended edition of "The Two Towers" includes several notable additions that were not present in the theatrical release. These scenes and sequences not only expand on the story but also enrich the world that Tolkien created. One of the most significant additions is the tale of Gollum's past, which is explored through a series of flashbacks. These scenes provide a poignant look into the tragic history of Sméagol, offering insights into how he became the creature known as Gollum.