Laura has a crush on a boy named Jimmy Hill. However, when she mentions the same character in the episode "The Return of Nellie", she refers to him as Jeremy Dodds.
Although Miss Beedle was married in a previous episode, she is still called "Miss Beedle" by the other characters.
Although the waiter is supposed to be French given his name, he pronounces the French menu items all wrong, including "salade niçoise": given his own name (Monsieur François "fran-swah"), it's the same sound with the cedilla turning the C into an S sound, so the character, of course, should have known to pronounce it "nee-swahz"; but, instead, the actor pronounces the word as "nee-kwahz".
When Laura is playing baseball outside the school, she hits a homerun but there is no sound effect of the ball connecting with the bat.