A caricature of "Urusei Yatsura" creator Rumiko Takahashi appears during the Tomobiki town hall meeting scene. She is sitting in the same row as the man speaking to Mendou. She's the short-haired woman with the glasses and the pink jacket, on the lower right-hand corner of the screen.
At the Tarouzakura viewing party, Ataru gives Lum a piece of food from his box-lunch, and she gets angry after tasting it, yelling "What did you feed me?". He had slipped her an umeboshi (pickled plum), which he found out in Drunkard's Boogie (1982), makes Oni people intoxicated. He fed it to her as a prank, like some teenagers do at parties when they spike the punch.
The movie was released around the same time Lamu (1981) ended. The series producers had intended to make more movies, but Rumiko Takahashi so hated this movie that she refused to sign off on any more movies. The next movie was a direct adaption of the final manga story, and the sixth movie was a 10th anniversary story that was made by a completely different team.
When Sakura and her ghostly companions arrive at Tarozakura, all of the visitors flee in terror. Among the stampede of people is Kei from Dan et Danny (1985), who is firing a gun as she runs.
After Megane's house is destroyed by a missile, a model of the USS Enterprise from Star Trek (1966) can be seen in the foreground.