The Wizard of Oz is a 1939 musical/fantasy/comedy film adapted from the 1900 novel, “The Wonderful Wizard of Oz” by L. Frank Baum and produced by Metro-Goldwyn-Mayer.
It features a scene where the Scarecrow inexplicably has a revolver firearm. That isn’t it however; the Tinman has a wrench (along with his normal axe), the Lion has a bug catching net, and a two-handed pump sprayer with the words “WITCH REMOVAL” (or REMOVER), and the Scarecrow actually has another item that isn’t seen or heard from again after the scene; a walking staff/stick.
The items possessed by the other members are usually not even mentioned within the Mandela Effect community when reporting on it. It seems like the gun that the Scarecrow is holding is the most shocking to people. The Mandela Effect here is that people do not remember the gun and are convinced that either this scene never existed or he never had a gun.