From The Research Department of Uggabugga

Bushisms Galore Since 1999.

He hasn't found one pattern in Bush's speech malapropisms and his listing has some errors of his own.

I have noticed Bush does have a lot of Freudianisms - subconsciously he is trying to say what he really thinks, but this is not consistent. I hesitate to draw too much attention to this as people will be all over my frequent grammatical mistakes but I did used to listen to his speeches just to catch the mistakes and see what he was really thinking.