They've also gone out of their way to explain things more. For example, Den explaining that all ships that crash into Fishman Island eventually end up at the Sea Forest, and that the Sunny would be there. I remember when we first saw Franky in the manga he was already there with Den for no explained reason at all.
Him being shown going down there also helps to establish that this is a different place some distance from FI, same as the fishman district. A lof of people were really confused about this with the manga. Let's just hope the anime stays at this pace and quality.