New animals and furniture just got added: Bluebear, Antonio, Phoebe, and Raddle! And a ton of new furniture, noticeably tiki torches, campfires, some new rugs, medical machines that go Bing!. I had all 40 animals unlocked, and 37/40 befriended, so this is just in time.
Rather than wait for the new ones to appear in random rotation, I'm starting to call them up with the Calling Cards I got from levelling other animals to Level 10 or 15. Never waste leaf tickets on anything temporary, only on inventory, market boxes, and maybe camper paint jobs.
If you visit my.nintendo at least once a week, you can click on your Mii wandering around, sometimes it'll give you coins (Club Nintendo points). Then hit Redeem, and you can redeem both AC-only points and Club Nintendo points for materials, like the ever-scarce cotton; in the app, you can only redeem AC points. I wish I could trade over some Miitomo points, too.
You can mark craftable furnishings as Favorites (star icon) on the order screen, without finishing the order. Do this for all the items you need to summon each animal, and for their special request items, and then they'll be on the star tab, without having to go hunt for the item or look thru contacts again. When you actually craft it, un-favorite it so you don't have to see it in the list again.
After crafting 4 levels of the Cool street scene instantly (but had to wait for materials), for the 5th I'm now back to a giant 48-hour construction box and the endless sound of hammering and sawing. UGH. I'm at 240-something CC now, so I'll finish the holiday items tomorrow, a day ahead of prediction.