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Trivia[]
The title is based on another Scholastic franchise, I Spy, which itself is based on the phrase "I spy with my little eyes".
This is the second appearance of Ratney, and a continuation of Carlos Gets the Sneezes.
Arnold's body is explored for the third time in the TV series. This is also the first time in The Magic School Bus Rides Again in which a field trip is taken inside him.
In the credits for The Magic School Bus Rides Again, a specific student and his/her/their voiceover is credited separate from the others as the co-star of the episode alongside Ms. Frizzle. For this episode, it is Arnold.
Carlos also mentions that he plays baseball, like Ralphie.
This is the first time in which the entire class didn't believe a classmate. In this case, Keesha.
In "Janet's Mystery Gene", Carlos talks about his transformation into a butterfly, which happened in this episode.
In the Scholastic Entertainment description for the episode, Ratney is referred to as male instead of female.