I'll put the original, the correction and the source for this correction.
1) Lore magical +20 -> Lore magical +10 and Power manipulation +10. RMSS book, this profession is not corrected in the essence book as the others (errata).
2) Directed spell cost 2/5 -> Directed spell cost 1/4. RMC2 Master Skill Table, if we look well we see that the final directed spell cost for magician used in books is the 'targeting' skill, not the 'directed spell' cost, maybe with that name it there were confusion and the incorrect cost were printed, but I think the real author's intention was always the cost 1/4 (maybe the same failure than with the final bosses in videogame SF2?).
3) Self control cost 6 -> Self control cost 3. Common sense, this correction is for ALL professions. With the original cost 'meditation' is cheaper for fighter than magician (...how it can be?) if we add the skill+category cost for the complete skill bonus. So for ANY profession, if the cost is greater than 3, the real cost is 3.
We need to make a correction more if this cost is used, and is the why for this cost >3, we need to add in restricted skills: all adrenal self control skills. This is more correct IMO.
Think well about this, only for adrenal skills, is correct that crazy cost for mnemonics or control lycanthropy?, I think not, so if the purpose is increase the adrenal skills cost, then is not the easier and natural way classify them as restricted and not draging the entire category with them?.