Other mistake: When the thresher blows for the second time, Mr. Ages slides down it into a large chamber into a basket. When he falls into it, he is translucent for a second.

The Secret of NIMH (1982)
1 other mistake
Directed by: Don Bluth
Starring: Dom DeLuise, Derek Jacobi, Elizabeth Hartman, Arthur Malet
Continuity mistake: The sequence in which Dragon is chasing Mrs. Brisby through the field, up the tree and eventually into the mill's lake, watch his eyes. The original placement is (from viewer's perspective) blue on the right and gold on the left. When he chases her up the tree the gold one is visible on the right, it then switches back when the camera cuts back to a wide shot. This happens again a few seconds later near the lake.
Nicodemus: In the beginning, we were ordinary street rats, stealing our daily bread, and living off the efforts of man's work. We were captured, put in cages, and sent to a place called nimh. There were other animals there, in cages. They were put through the most unspeakable torture, to satisfy some scientific curiosity. Often, at night, I would hear them cry out in anguish. Twenty rats and eleven mice were given injections. Our world began changing.
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.