I stated in another post that Star Wars has a huge following of very dedicated fans.  The fact there is more than one change to this classic movie is very shocking.   It makes me think the effects might be a bit more uncontrollable then we think, or its a ripple from a butterfly type effect in the matrix.

The famous line has always been Luke, I am your father and thousands of people have that very same memory.  The new No, I am your father is not from my reality.