A critical step in developing films is loading it correctly in the reel, but doing it wrongly can give you some good surprises!
Loading the film in the reel is one of my nightmares when developing at home with Rodinal. You have to be careful not to have the film not to touch itself or else everything could go wrong. I have to confess, I am not good at this. Actually all the films I have loaded in my stainless steel reel have touched itself. But instead of being depressed about it, I have been surprised by the results, the beauty of the unexpected.!
The effect that it has on the final photo is that you will get a burnt effect. Chemical reaction goes crazy in the parts where the film contacts itself and gives this unexpected bonus to your photos.
So if you are not good loading your films when developing, then it is not a bad case after all. Just do it like me and let the mistakes give you this old-style, bad-treated photos for it has a great charm of its own!