The first and only time that Phoebe's old school is shown other than just mentioned like her catchphrase she often brings up when on field trips. Later in The Magic School Bus Rides Again, Phoebe transfers back to this school, hence her catchphrase; and neither she nor her old school are shown again, and she is replaced by Jyoti in the newer animated series.
This episode reveals that Arnold is allergic to pollen, in which he reacts by sneezing.