This Island Earth/YMMV

The film contains:

 * Big Lipped Alligator Moment: While the context makes it clear that the whole "plane turns green and lands itself" was the Metalunans saving Cal because they needed him, the whole incident has pretty much no impact on the plot and is never mentioned after the scene ends. (Lampshaded in MST3K: "I don't want to talk about it any more"). If you'd cut from Cal flying his plane to Cal arriving at his lab, you'd never notice that something was missing.
 * Designated Hero: Cal. The man does nothing, even when his love interest is attacked by a MutAnt.
 * They Wasted a Perfectly Good Plot: An hour of setup, complete with competing viewpoints from Exeter and Brak, and once they get to Metaluna... it all becomes a "Point and shriek at the aliens" fiesta.