Checkout for an early start from Croatia. The HM above the E quay will stamp your crew list for the folllowing day. He is open 0900 - 1300 and 1730 - 2000. The poolice have to check passports just prior to leaving, and will arrive if summoned by phone - numbers on their cabin window on the W quay with flags. They take 20 mins to arrive, though will tell you 5-10 mins.
We were frequently advised to proceed directly out of Croatian waters. No deviation, and certainly no anchoring after the police check.