It looks to me like the film had adhesive tape stuck to it that was later peeled off. Pulling away sticky tape gives off light - http://ksj.mit.edu/tracker/2008/10/b...etc-scotch-tap
It looks like the tape was applied to the base side of the film and the 'texture' of the image is due to the tape coming away in little jerks resulting in flashes of light.
This may be the reason that the image 'curls' around the sprocket holes.
I'd say, unless the OP had applied tape at some time, is that this is a factory problem. Possibly from the tape used to hold a bulk roll before the film was spooled into individual cassettes?