The reason for Adam Elliot's films lack of traditional dialogue (I.E. Conversations) is because of the films low budget requiring to lip sync the dialogue.
To create the water effect in the film, lubricant was used.
Director Adam Elliot likes using snails in his work. In this film they are a thematic focus. In his last feature film "Mary and Max" (2009) Max has pet snails named after famous physicists and in his debut short film "Uncle" (1996) the nameless titular Uncle liked to collect and smash the ones on his mailbox every Monday.
The second feature film by Adam Elliot since "Mary and Max" (2009). His other films range from under ten minutes (his family clayography trilogy "Uncle" (1996), "Cousin" (1998), and "Brother" (1999)) to around twenty minutes (the academy award winning "Harvie Krumpet" (2003) and his previously most recent work "Ernie Biscuit" (2015)).
The character Harvey Krumpet from Elliot's previous film (Harvey Krumpet 2003) makes an appearance at the nudist colony at 52:06 in the hot tub in gray.