Contrails when flying
This is literally one I didn’t notice until a friend mentioned it too me recently. If you’re flying anywhere or someone is visiting your island, check the sky. For a while after the flight ends you’ll see it left a contrail in the sky. It’s a nice feature. Also, when it stops raining, you’ll sometimes you’ll see a rainbow in the sky as well if you look for it.
Orchestrated soundtrack remix
If you have a moment, run into Nook’s Cranny before the store closes. Sit on the chair behind the counter and just wait. When it turns 10:00 p.m., if you’re anywhere but the chair you’ll be asked to leave, but they can’t move you if you’re sitting.
Instead you’ll get a really weird Easter Egg where you’ll get to hear an orchestrated version of the soundtrack. It’s honestly really well done and impressive so it’s worth being “that customer.”