The document describes three editing techniques used in a production diary:
1. Colour grading was used to make a scene stand out more by warming the grass, which took little time.
2. Three-way colour correction, where adjusting the midtones was most important to balance character and background, was the most challenging as it took significant time.
3. The razor tool allowed clipping unwanted footage to shorten the trailer and make it more relevant, making it the most useful technique.