• Warning: Spoilers
    Especially if you've read the play, a lot of what the play does is explicitly gone against in the movie. For example, one key thing about the play is the absence of men, especially the absence of Pepe el Romano, yet throughout, there are silhouettes etc.. Also, ***SPOILER HERE*** at the end, as Adela is crying and thinking and going all slow-mo before killing herself, ALSO goes against the nature of the play. We're not supposed to know what's happening until we hear the loud noise offstage.

    Those are two key points. There are other stuff that's in the movie that wasn't in the play and vice versa, and it kind of takes away from the symbolism that Lorca utilizes in his play. Lorca is VERY symbolic and poetic, and by changing those parts, it ruins the movie.