Rian Johnson made sure to show that Luke had landed his X-Wing Red 5 in the water along the shore of Ahch To island. J.J. Abrams used this to his advantage by Having Rey use it to fly away from there after attempting exile. It's a great callback and a powerful storytelling tool, not to mention nostalgia bait.
Also in this same scene... PORGS!!!
In Force Awakens Poe Dameron was merely a hotshot pilot and squad leader, but in Last Jedi it was strongly underlined that he was being groomed as General Leia's next-in-line. In this film, upon Leia's death, he finally takes up the mantle of leading the Resistance against Palpatine's fleet.
At the end of Last Jedi Luke tells Kylo that he will always be with him, just like his father. This movie revisits that line by having Han Solo cameo as a memory, albeit one seen in a new light of good so that Kylo can relinquish the Dark Side.
At the end of Last Jedi Rey is the keeper of the Sacred Jedi Texts, and in this film she uses them as study as well as a clue to take her to the Wayfinder Device.
On Ahch To island Rey is naturally drawn to the Dark Side, as Luke pointed out to her. Hence, it makes more sense that she is Palpatine's granddaughter and that she would have that evil legacy within her, despite her ultimately never succumbing to it.
J.J. Abrams not only utilized the Forceback technique of communication between force users, but enhanced it. In this film Rey and Kylo are able to make physical contact with each other and pull objects across distances.
Forces from all over the galaxy coming to the aid of the resistance at the end of Rise of Skywalker is never said outright to have been inspired by Luke Skywalker's one-man standoff with The First Order in Last Jedi. In fact, Poe gives credit to Lando for the galvanizing seen at the end of the film. We would like to think, though, that this WAS the galaxy being inspired by Luke, and it is in fact a continuation of the last film's message.