In episode 2, Ariel was seen driving the car to school. In this later episode she is just getting her learner's permit.
Ariel gets her learner's permit and Joe is teaching her to drive. Yet, 2 shows earlier, (the one with the school project babies) Ariel drives to school.
At the beginning, the note has '1927' above 'Hennepin'. When the note is shown to Scanlon, the two words are side-by-side and 'Hennipen'.
Ariel gets her learners permit and Joe gives her her first driving lesson in this episode. But in episode 2 of this season (Things to Do in Phoenix When You're Dead), Ariel was driving their car while Joe sat in the passenger's seat, so he must have been teaching her at that point.