In the lesson for object oriented programming, I was thrown off by the disparity between the functions listed in the "Writing the Cookie Cutter" and "Using an Object: The Details". In the first section, 'display()' and 'drive()' are listed. Then in the second, when introducing dot syntax, 'display()' and 'draw()' are used.

I used both pairs in my code: one for the functions in my Car class, and another in my 'void draw()' section. This, of course, didn't work. I caught the error after just a little scrambling, but I expect this lesson would be a bit easier if the functions matched up between sections.