The only reference to the scouring of the Shire in the movies is an image which Frodo sees in Galadriel's mirror. The movies have Frodo, Sam, Merry, and Pippin return to an unspoiled Shire whereas in the book Saruman had taken over.
For the movie they decided to move a similar scene (with Grima killing Saruman and Grima getting killed by Legolas instead of some halflings) from the end of the return of the king to the beginning of it. This probably was a wise move as many not so enthusiastic fans of LOTR complained that the movie was going on for too long after the destruction of the ring.
It may be hard for not so enthusiastic fans to appreciate the message of the scenes after the destruction of the ring; the fact, that is, that there is not simply a "happy end" but that some scars of the war will never heal, that the elves are leaving middle earth, that a new age begins.