The first trailer was made back in June 2010, during the I’m a scientist, Get me out of here competition. It was made in a single day (script, shoot, edit) before I had a fully-fledged idea of what the final film would be like. It’s a bit rough around the edges, but was a lot of fun to make.
The more recent trailer (Aug 2011) was designed to give a taster of what the final film would be like:

