What's an unintended story consequence that must be true given the facts that a movie presents to the audience?

After reading this post yesterday about the fact that the Spy Kids' mother must've had them as a teenager after putting together multiple lines of dialogue from the films and doing the math, I started to think, what other movies don't pay attention to their own details, and it creates unintended story consequences like this? via /r/movies https://ift.tt/32GxMz1