[Milhouse]

It (the script) can't recognise corruption (assuming you're referring to visual artefacts in your cached images) although such corruption would suggest some sort of system instability.

Your option is to either a) delete individual artwork (using s/d) and then re-cache ( c ) - time consuming for 30 images, b) force re-cache individual movies (C movies <movie-name>) - again potentially time consuming or c) cut your losses and nuke the cache then re-cache ( c ) which may still take a while but at least you can do something else while it runs.

However it sounds like you've got a fundamental problem with your system that is causing all this corruption in the first place, and fixing that should be your priority.