I guess the film makers did one thing right in putting their best effort into the first half of the film, so then at least some would watch the ending for the resolution despite it's decline in script, editing, pacing and sense.
To be fair, we did laugh at many scenes at the beginning, though some from the cringe element. The two sisters are oddly prudish even for two non-nudists. The cast appears to be a mix of actors and extras given speaking parts. Perhaps some agreed to frontal nudity and others didn't, because we get a mix of straightforward nudity and fan-dances with comically, strategically placed props.
However, that's not what really let's it down. The sound is choppy throughout, and the camera needlessly handheld at times. In the last act the script, not strong to begin with, falls apart, and actors seem to be ab libbing with the most banal non-communication. The editing goes to pot, especially with the multiple fade-to-black cuts during the not-sad-at-all funeral. The final insult is that the resolution of the story is not revealed to us - the argument and subsequent agreement between the sisters is without audio, with just...airplane noises over the top? WHY? Was the audio not useable? Why not reshoot? Was the script so lame that it was deemed unworthy of inclusion? Again, reshoot, please! It couldn't have been expensive to shoot - two girls and a car on the side of a country road.
I don't know. Hopefully it was a learning experience for everyone involved.