Cleo's arm was slightly wet after she 'unscrewed' the fire hydrant. But she didn't change into a mermaid.
A time-lapsed video of the beach at sunrise was used to show passage of time.
This episode first aired in the United States on March 14, 2008 along with "Pool Party" as a TV movie.
All the underwater scenes were filmed at 'Sea World'.
Season 1 started filming from October 10th 2005.