Beach episodes are very common in anime, usually serving as a reprieve when the show has been heavy to add some comedic relief, but they are also often used as a tool to move romantic relationships ...
Attack on Titan and One Piece are famous for dropping minor details that blow up into major reveals later, and they're not the only ones.
Naruto and Tsunade did not hit it off upon their first meeting. Tsunade was incredibly dismissive of the knuckleheaded ninja ...