When Sylvia and Dr. Forrester are in the farm house, Sylvia cooks some eggs, then places the plates of eggs on the table. As she places them down you can see a plate with toast stacked on it. This plate disappears in the next shot of them both sitting down.
Steven Spielberg saw this film when he was a child and was fascinated by the Martians. He later based E.T. from E.T. the Extra-Terrestrial (1982) on them.