Kerry cannot whistle. He also cannot swim, a trait shared by his character, Neptune.
Kerry provided the voice for the character who shouts "EEEE-YUUP!" in "The Badge and The Burden". This is a reference to the catchphrase of Andrew Blanchard, another member of the Internet Box Podcast.
During development, a cutout of his face was sometimes used as a placeholder for props that the animators did not have yet.