It's almost arrogant to try to interpret this film but if you look at the dumpster scene in tandem with the box, key, old couple and "Betty" you should arrive at something satisfactory. I love most of the weavings of this film (in particular the diner scene, the poolside party scene and the interactions between the two women) but some leave me cold (Silencio-related stuff and the cowboy-related stuff). I don't think any two people will have the same reaction to this film and I would not hold it against anyone if they unreservedly loved or hated any and every scene.