Know about repackaging/relabeling. <-- People told me this, but I didn't listen. Wish I would have listened more.
Know about extended care facilities. Know about the emergency kit.
Know about CSs, OTC CSs and ephedrine limits.
Know about central filling. As far as I know, Fassett does not have this in his material (at least I never came across it).
Know about a pharmacist's duties and what can/cannot be done by interns, techs and assistants.
Know about what things the BoP needs to be notified about and WHEN.
Know about samples.
Know who can prescribe what and how it is determined.
...
That's some good guidance to get you started.
I used Fassett but felt unprepared for some of the questions I got.