Heartwarming: Kamen Rider X Super Sentai Super Hero Taisen
The end of the movie has Marvelous reuniting with the rest of the Gokaiger and getting hugged by Gai twice, Eiji apologizing to a delighted Hina for worrying her, and Diend kinda-sorta accepting Tsukasa's friendship in his own special way (Joe's too). Oh, and then there's OOO and the Gokaiger reaffirming the friendship between Super Sentai and Kamen Riders, and Fourze and the Go-Busters doing the same with Gentaro teaching the Busters how to do his "uchuu kitaa!" pose.
The way Gai kind of fanboys over his team's successors in that scene is pretty heartwarming as well.
Despite all the wackiness of the Net Movies, the second set (the Sentai Murder Investigation) has a scene where several Riders and Rangers show that they all own merchandise of the other franchise; a show of mutual respect of fellow Super Heroes. Mood Whiplash occurs in the following scenes, but all in all, a nice touch.
When the Gokaigers are attacked by Silva, who has been revealed to have been the real main Sentai villain in the movie, Red One tells Gai to "show him the power of a real Silver" in order to encourage him to defeat his old enemy.