If you make Resetti appear and began to draw rings around him, he will disappear immediately.
This may be a misunderstanding of Super Smash Bros. Brawl as if Resetti fell off the stage, he would disappear.
If you make Resetti appear a certain number of times, his brother Don will appear and apologize for his brother's ranting.
He only appears in the original and City Folk.
After making Resetti appear once, the player can go around smacking rocks with a shovel or axe a certain number of times and make a crack appear in one of them. If the player continues smacking the cracked rock, it breaks and a tunnel appears, which leads to Resetti's house.
This may be a misunderstanding of the Resetti Observation Centre in the Japan only e+ version, as well as Animal Crossing: City Folk.
If every kind of fossil in the game is sold to Tom Nook, he will give you a whistle that calls Kapp'n to take you to Animal Crossing Island.
Again, this was only available in the original Animal Crossing,as well as New Leaf.
If you help Gulliver 36 (or some other large number) times, the day after you shoot him down one more time he will take you to the moon where a very special piece of fruit is available.
After you shoot Gulliver down the first time and get his present, he won't fly over the player's town again unless a new game is started.