Continuity mistake: When Nicodemus gives Mrs. Brisby the red amulet, she notices an inscription on the back of it and the camera zooms in to it. Before that, there was no inscription, and the back was blank.

The Secret of NIMH (1982)
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Directed by: Don Bluth
Starring: Dom DeLuise, Derek Jacobi, Elizabeth Hartman, Arthur Malet
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Teresa: Oh! Auntie Shrew.
Cynthia: Oh, Auntie.
Martin: Oh, no.
Trivia: The main character, Mrs. Brisby, is called Mrs. Frisby in the book the based the film. The name Mrs. Brisby had to be used because the trademark for the toy "Frisbee" was taken.
Question: If Jonathan and Mr. Ages were the only mice to survive the escape from NIMH, then where did all the other intelligent mice come from? Did one or both of them father a new generation of intelligent mice? Mrs. Brisby's marriage to Jonathan makes this all a little confusing.
Answer: What other intelligent mice? I have watched the movie many times and I don't remember seeing any other intelligent mice. The mice that tried to escape with the rats were sucked down the ventilation shafts, so we don't know what happened to them.
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Answer: Mrs. Brisby tells Nicodemus that Jonathan had been teaching her to read and her children as well. The children were better at reading that she was but that might be something that they inherited from their father. I think Mr. Ages was also able to read so that makes him intelligent as well. Remember the injections that the mice and rats were given also gave them the ability to read.