According to credit lists for both 'Without a Paddle' (2004) and its sequel 'Without a Paddle: Nature's Calling' (2009), there are no common cast and crew members who worked on both pictures.
The nick-name of Heather Bessler (Madison Riley) was "Earthchild".
Another first sequel had a similar subtitle. This was 'Ace Ventura: When Nature Calls' (1995). The 'Nature's Calling' subtitle to 'Without a Paddle: Nature's Calling' (2009) (V) is similar to 'When Nature Calls' .