In the Beanbean Castle area, there is a photographer that will take pictures for your passports for 100 coins. He will ask you to pay 100 coins. Say "No", and he will offer to take them for 50 coins.
During the normal version of the attack "Fire Bros.", try abd count how many fireballs Mario conjures up. Smack the fire back, but be sure to MISS the action command on the last one. You'll do more damage in the last part than normal. You'll want to be pretty precise here, because going too early or late will hinder the total damage done.
In the lobby of the Yoshi theater, there are four posters on the wall referring to Nintendo video games:
1. Kirby Story--referring to the Kirby series
2. Wario poster--referring to the Japanese box art design for "WarioWare, Inc.: Mega Microgames"
3. M&L--referring, of course, to this game (more specifically to the game's originally intended title, "Mario & Luigi")
4. Legend of Stafy--referring to a Japan-only game series of the same name
When Cackletta divides into 3, use any item, but don't attack. When the Cacklettas attack, you will see one use the left arm only, and right arm, and both arms. Attack the one that uses both arms.
There is an Island Surfing game somewhere near Oho Oasis. After getting 1st prize (Casual Coral), you can fulfill the same criteria and get 2 Hoo, Woo, and Chuckle beans each time! By doing this, you can gain infinite beans and, possibly, infinite stats from blending these infinite beans.