I'm new and I don't know if this is a secret or if it has already been mentioned but here is something quite subtly amusing.
After sleeping in the "Come Over Guest House" for the first time, on the morning you are suppose to wake at 8AM to meet Joy to get a job, open and then look out the window on the right side of the room and you can see two cats sitting on the ledge. Zoom in a bit and look to the left and you can see Joy looking agitated and impatiently waiting for you to come out.
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There's also some info on the Brawling Uppercut Move that Delin teaches you that I don't know if many people know about.
If you already have the $500 required to meet Ren when you have to you are
not allowed to exit Beverly Hills Warf and instead you have to progress the story along. After you've finally have met Ren you can exit and then talk to Delin who is either in the office or outside near the offices door. Talk to him about a job and then you can carry crates and after Delin will teach you the move.
I know it's been said many times that you can do this whilst trying to gain the $500 but I don't know if anyone knew that you could do it after you had already met Ren and he's waiting for you in Fortunes Pier (I think). He'll say something like "finally got here"