"Extraneous material" refers to anything that is not relevant or necessary to a particular topic or situation. It is extra or unnecessary information that can be disregarded or should be removed to focus on what is important. Full definition
There's also a lot of extraneous material that would have been better off left on the cutting room floor. (reelviews.net)
It shall not contain added extraneous materials not provided for by this definition.... (vet.osu.edu)
Leptospira cells are extensively rinsed via a proprietary diafiltration process which helps to reduce extraneous material in the vaccine. (zoetisus.com)