There have been some threads here on film quality and have included Kodak film quality. I thought I might make some comments on this so you would understand it.
ALL film when coated will have some degree of defects on the 5000 ft 42" master roll or whatever size a given manufacturer produces.
Kodak scans every square millimeter of coating produced with a surface scan and a scan through the film to look for surface defects and deep defets. This is programmed into a huge software package that maps out the optimum cutting strategy for a given roll, such as 35mm, 120, 220 and etc. when using 5 mil support and LF and ULF formats for 7 mil support. It is designed to include bad spots in the master roll just like formatting a HD detects bad tracks or sectors.
This program optimizes the yield of film per master roll.
Now, when someone asks for a custom cut, the software must be changed to included other options in sizes so that waste of the good coating is optimal and low.
Virtually every square mm of Kodak's bad coatings goes to scrap and all units are optimized to give the best cut for highest yield.
IDK how others do it, but 100% inspection is carried out at Kodak at the coating stage and at the packaging stage.
Just an FYI information note.