Thoughts about last episode:
*Well, having a hyper-intelligent Orang Utan is somehow creative, but would fit better in the world of One Piece.
*I didn't like the fact that the ship was a manifestation of a stand which can be seen, unlike other stands. It breaks the rules, although it might be convenient.
*So there's a ship which is a stand and there are sailors on it, but why and how did they get on there, if there's no captain?
"Rules" in JJBA are only rules unless they aren't. Don't think about it.
But I think Forever's Stand (that's the ape's name that I don't think the anime mentioned, wasn't named until years after in an artbook, named after the Wu-Tang album), creates a large boat out of a smaller one, so the large freighter isn't his Stand but it also is, I guess? I think Araki just wanted to have a smart ape for Jotaro to beat up.
I think the bigger question is why an orangutan decided to join DIO. We've seen people doing it for his charisma, from a flesh bud, or because he promised them something. Did DIO pay Forever with Playboy mags and cigs?
Also all the sailors were survivors from the original boat that Deep Blue Moon destroyed.
Also this encounter does serve the purpose of showing that it's not only humans that can have Stands, and also that Stands can really be and do anything.