The licence plate of Mrs. Cantwell's car is "RABF09", the production code for this episode.
This episode is the second or third happening of some occasions throughout the series:
Second time where a teacher bullies a Simpson (first one was " My Fair Laddy");
Second time where Homer's eye gets injured and must wear an eyepatch (first one was " The Way We Weren't");
Second time where Springfield Elementary School has a faculty member with an embarrassing name (first one was " Separate Vocations");
Second time where Homer where prays to Superman (first one was " Lost Our Lisa");
Third time where a substitute teacher fills in for Miss Hoover (first two ones were " Lisa's Substitute" and " Rednecks and Broomsticks"). The substitute teacher in this episode have a reversed personality to the substitute in the former.
Nina Skalka is seen in Mrs. Hoover's class, despite being a fourth grader and often seen in Mrs. Krabappel's class.
In Mrs. Cantwell's car, the steering wheel is on the right. But all subsequent shots put the steering wheel on the left.
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