Here's an interesting one for you; the company I work for consists of a group of 3 hospitals, all located in the same city. My PACU colleagues and I are the most experienced in the entire group. I am the only RN out of all of them who is certified in Anaesthetic and Recovery Room practice. The company trains student nurses, a portion of which training is supposed to be in PACU. Guess what? They go to our sister hospital for their PACU stint, where it's unlikely they actually learn anything.
I would suggest the most important subjects would be neuro-muscular blockers, length of action and reversal, opioids and optimum dosage, side-effects of common anaesthetic drugs, airway maintenance and PLENTY of practice with ventilating apnoeic patients. Correct insertion of laryngeal masks, and, in my personal opinion, regular practice at intubation. Malignant hyperthermia and treatment thereof is vitally important, but it's something that is more likely to manifest intra-operatively. Then again, I've seen spasm of the masseter muscle frequently post-operatively, but it doesn't necessarily mean Malignant Hyperthermia.