The accident with the sea plane cartwheeling on landing, was not in the script - this was a real unplanned accident. The script simply asked for "engine problems at take off". The pilot was unhurt.
The film's closing credits state that this production was: "Filmed entirely on location in British Columbia". The movie was filmed entirely in the area of Vancouver, British Columbia, Canada. The mountains seen in the movie are the Cassiar Mountains of British Columbia.