Caterpillar Marketing Representative interview questions

From what I understand, all marketing positions at Caterpillar are filled by a recruiter. The interview process with the recruiting agency was straight-forward; good preparation. After that, I had a phone interview with Caterpillar - person who heads the trade shows - and it was very casual and informative. Less about me and more about Caterpillar. The following week, I was invited to meet that person face-to-face with a few other marketing employees. They liked to see samples of my work.

Initial contact started at a campus job fair. Conversations with HR reps went well, so I submitted my resume. I attended presentations on campus put on by Caterpillar that week. First round of interviews held on campus. Second interviews at Caterpillar HQ. Interviewed by three staff members - three very different personalities. Questions weren't overly difficult, a few were challenging. They were looking for very specific experience (mix of marketing and technical). Received a call a few weeks later that I would not be receiving an offer.