Hello-Goodbye movie review & film summary (1970)
"Hello-Goodbye" is an awfully dumb movie, no doubt about it, but it offers an interesting variation on our old friend, the Idiot Plot. An Idiot Plot, you'll recall, is a plot that requires everyone in it to be an idiot. Otherwise someone would do the obvious, the crisis would be solved, and the movie would be over in 13 minutes flat.
Source: rogerebert.com