Film is as sensitive and delicate by nature.  One of the reasons so many of us appreciate it so much is that it shows 'every little thing'.  It's also an excellent attractor  for dust/hair/fibers and 'stuff'.   We try to be as careful as we can when we handle it, but sometimes there are results that aren't expected or desirable.   Generally, if you see something like a black fleck/hair/bug(yes a bug) on your negative film scan, it is actually photographed on the film emulsion. Similarly, if you see something that is white, that shows up because it was laying on top of your film when it was scanned. We process and scan thousands of rolls of film per year.  We do check/monitor/clean our machines constantly; but we know that we are not perfect, and not every file we create is perfect.  We do try our best to handle and respect your film as if it were our own.  We shoot film. We understand it's important to you.  It's important to us, too. Our scanner does not automatically 'fix dust' or repair imperfections that occur on your film....nor do we take affected images in to a software app such as Photoshop to repair irregularities. More and more film arrives in the lab that is out of date and from old cameras and 'toy cameras'.  These rolls have a higher incidence of scratching than others because they have an inherit curl...especially the smaller formats like 110, 126, and APS films.  The surface is often distinctly 'arced'.  It can rub against parts of your camera, the film canister, and our equipment. Again, we do not repair or fix these imperfections.