Corrected entry: Whenever Ka and Bee "speak" they open and close their mouths, presumably to indicate that is where the sound is coming from. However, dolphins don't communicate through their mouths - they have no vocal chords, they don't even breathe through them, their mouths are just for eating, period. All sound comes from the blow hole, and that is where Ka and Bee would speak from if they really learned how to speak English. Their mouths wouldn't move unless they were hungry.
Day of the Dolphin (1973)
1 corrected entry
Directed by: Mike Nichols
Starring: George C. Scott, Paul Sorvino, Fritz Weaver, John Dehner, Trish Van Devere
Continuity mistake: In the scene where Ka and Bee jump over the "wall" towards the end after attaching the bomb to the boat, they have nothing on their backs; but when they jump into the water, the 'holder' of the bomb is seen on their backs again and the woman takes it off then.
Harold DeMilo: Are you blackmailing me Mr Mahoney?
Curtis Mahoney: Goodness no... I'm just an average person with an above average curiosity... and of course I don't make make friends easy.
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Correction: Dolphins will open their mouths when "talking" to mimic humans. Although they do not need to open their mouths to produce sound, they see us do it and simply copy our behavior.