deep seated vs deep seeded – The first one is correct. A feeling or attitude is seated deep within you. No gardening is involved.
faze vs phase – Two completely different words! I know, right? Don’t let it faze you.
cache vs cachet – Having a hidden cache [sounds like cash] of cash might give you a little cachet [sounds like cash-ay].
stage left vs house/camera left – Stage left is left from the point of view of the stage, house or camera left is left from the point of view of the house or camera. I haven’t heard ANYONE use these correctly in AT LEAST the last year, no exaggeration.
prodigal – The prodigal son wasn’t prodigal because he came back. His behavior before he returned was prodigal. It has nothing to do with returning.