The filmmakers have said in interviews their story is based on a 2001 National Public Radio "All Things Considered" report about two women in the Seattle suburbs who started a biohazard removal/cleaning service. They are best friends, not sisters.
About 54 minutes into the movie, when Oscar is crossing a street, a microphone can be clearly seen on the top left corner of the screen for a few seconds.
In the scene where Norah and Lynn are at the party, Norah passes the joint to a guy next to Lynn. She does not get it back, but she can be seen smoking it in the following shots.
When Norah chases after the kitten, there is a small table and a cat statue on the porch. Later, when the house is burning at night, the table and statue are gone. A subsequent scene of the porch in flames has the table and cat statue back again.
Sunshine Cleaning is the name of a cleaning business started by two sisters, Rose (Amy Adams) and Norah (Emily Blunt) Lorkowski in order to make some extra money. The Sunshine Cleaning company cleans up crime scenes.
Q
Where can I get the script?
A
You can read it online at: http://www.overturefilms.net/awards/media/pdf/Sunshine%20Cleaning%20Screenplay.pdf
Q
Is there an official website?
A
The official website for Sunshine Cleaning can be viewed here.