From the ESPN AFC South Blog, a little nugget of information from his days at WF. Not super interesting but it's worth the 30 seconds it takes to read:
Kit Burkholder from parts unknown writes: I played for Jim Caldwell at Wake, and the swearing rule is true. Coaches and players had to put money in the jar for swearing, and by the time I left after the Aloha Bowl game, I believe Coach Caldwell's check-to-be written for swearing was over $100,000 (which never happened). He also had "Caldwell Standard Time" for us during training camp. We had to be early to every meeting and scheduled event by 10 minutes to teach us accountability. If you'd like more details, I'd be happy to provide.