There are at times vertical stripes that run along the film. Most of the time very faint, but more noticable in very low light exposures. Commonly caused from scratches on the film and when transfering come out as blueish stripping from top to bottom . Very thin, sometimes 2 to 3 lines.
It it very common with super 8.
If someone has shot a bit of super 8mm you will know exactly what I mean.