While coaching Frank, Margaret either becomes flustered by all the confusion of being interrupted by a phone call and by Frank's apparent failure to grasp the objective of the test questions or whoever was in charge of continuity for the scene failed to notice that Jane Wyatt has inadvertently turned the test booklet she is reading from upside down.
Even though he spells his name to the Judge as F-R-A-N-K, albeit in Spanish, the credits at the end of the show represent his name as 'Fronk'. This contrasts with the season 3 appearance of this same character, i.e. Margaret Hires a Gardener (1957), where the credits represent his name as 'Frank'.