Since this is a filler episode, it is not essential for the main Fourth Shinobi World War plot. However, it is highly recommended if you enjoy the mentor-student dynamic between Naruto and Konohamaru or want more context regarding Konohamaru's growth before the movie.
: Much of the humor stems from Konohamaru mistakenly believing Naruto's instructions are for a new version of the Sexy Jutsu , leading to several comedic misunderstandings with characters like Sakura and Ebisu. Naruto Shippuden Episode 422
: Left to figure it out himself, Konohamaru trains by seeking advice from other Konoha ninjas like Kiba and Akamaru for the "rotation" aspect. Since this is a filler episode, it is
: Konohamaru asks Naruto to teach him a new powerful technique. Naruto agrees to teach him the Rasengan , though his teaching methods are characteristically vague and sound-effect-heavy. : Left to figure it out himself, Konohamaru
Watch reviews and explanations of the training Konohamaru undergoes to learn the Rasengan in this episode: