Absolutely great episode. The sixth season doesn't get better than this. "Let the Sunshine in," as performed by Pebbles and Bamm Bamm, always gets me emotional! The scene where Fred first hears Pebbles and Bamm Bamm singing is interesting. Fred, about to take a nap, closes his eyes for a second. He opens his eyes because he hears the kids singing. This scene is not coded as a dream, because it didn't look like Fred actually fell asleep. Everything about this episode is superlative. The kids sing the same song at least five times, but it's still not enough! I could have watched and listened much longer. Pebbles and Bamm Bamm singing was one of the cutest, sweetest things shown in any cartoon. How could they sing when they couldn't talk? Who knows? They sounded good! Curiously, the ending of the episode confirmed that Fred was, indeed, having a dream. Yet, Wilma has a record of 'Let the Sunshine in." Maybe dreams can come true.