Basic Trope: An unresolved plot point is dropped from the narrative.
Straight: In the children's film The Bunnies and the Golden Carrot, the main characters Bertrand and Bonnie meet a cute mouse family. They make friends and spend some of the film together. The mice are last seen trying to escape from a mean cat. We never get to know if they manage to escape.
The mouse family gets almost as much screen time as the main characters, but we still don't get to know what happened to them.
Downplayed: The mouse family only appears in one scene.
Justified: Bertrand and Bonnie get Easy Amnesia at some time after leaving the mice. Of course they don't remember them.
Inverted: The "mouse family incident" and all other problems of all minor characters are resolved, but the main plot about Bertrand and Bonnie looking for the Golden Carrot becomes an Aborted Arc.
Subverted: The Stinger shows the mice somehow defeating the cat.
Double Subverted: Then an angry dog appears behind them...
Bonnie: What do you think happened to the mice? Bertrand:The mice? Bonnie: Don't you remember the mice? Bertrand: What mice? Bonnie: (long, completely accurate description of the mice) Bertrand: No, I don't remember. Bonnie: I don't either.
Zig Zagged: ???
Averted: In the end, the mice visit Bonnie, implying that they did escape.
Enforced: The creators somehow forgot about the mice.
Lampshaded: "I sure wonder what happened to the mice, Bonnie."
Defied: Bonnie asks Bertrand if he thinks the mice are okay. He's in doubt, so they agree to visit the mice, who turn out to be okay.
Discussed: "I hope they don't forget about us in the end!"
Conversed: "So the Golden Carrot was found, but what happened to the mice?"