Hello Chris,
On his creative process, incluiding writing a script for a feature film, Mr. Lynch always talks about ideas and catching the big fish. And never forget to write them down, because they can be lost forever in the wanderings of the mind.
Just found out he mentions that FrantiÅ¡ek “Frank” Daniel (American Film Institute) taught a way to write a script: use 3×5 cards, write the heading of the scene and when there are 70 cards, you have a script!
https://youtu.be/yngWNmouhP0?si=GZQawaTHePP9f50u
On page 7 there is a later mention about it:
http://www.movingimagesource.us/files/dialogues/2/64075_programs_transcript_pdf_202.pdf
Cheers!
Mikjail