Make sure you check your album progress (Select button while in the overworld) as that is invaluable for tracking down what puzzles you are missing. All the puzzles in the first 100% are tracked in those albums. Those are the easiest puzzles to miss, and they do have a grouping scheme. If your albums are all filled out, you know to look in the endgame areas for your last two puzzles, and then the TaiFab+ puzzles should be behind that.
Viewing post in Taiyaki Fabulous Museum of Fish comments
Album is all full, and I'm assuming Chad will give me the 202 after I complete 201 so I can summon Chad. I finished all three rooms of bonus puzzles, I believe I completed every puzzle in the house after that... I'll have to double-check all the ducks (geese?) and see if there are any objects that are interactable that I missed. Thanks for the advice, that narrows my search down a bit!