The fact that "cached phrase" has a similar pronunciation to "catchphrase" does not mean that they are related. In particular, this is not an instance of an egg

The fact that "cached phrase" has a similar pronunciation to "catchphrase" does not mean that they are related. In particular, this is not an instance of an eggcorn because substituting one for the other will result in a sentence that does not make sense. The quotes in the page you link to are instances of malapropism ( http://en.wikipedia.org/wiki/Malapropism http://en.wikipedia.org/wiki/Malapropism ).