This is a not-so-serious post about the movie “The astronaut farmer“. In the movie, the main character uses an old beat-up HP calculator to engineer his rocket. This makes sense, as you’ve read so far in this blog, because of the long-standing association of HP calculators and the american space program. Closer scrutiny of the keyboard layout of the calculator however reveals that the calculator is a HP-12C, a financial model. Considering the main character’s financial woes and main goal, this does not make sense. The props department should have chosen either a 10c, 11c or 15c.