I don't pretend to have elite football knowledge for starters, and it's hard to pick up on these things in real time when it's the natural tendency of the viewer to just follow the ball. However, the Targum has a good analysis of some personnel changes that Rutgers used against Arkansas - which in all fairness, a few commentators have mentioned in the comments here, and elsewhere as well.
One change was more of a use of a 3-4. I noticed the three-man fronts, but assumed Rutgers was just using dime and quarter looks - Snyder was out there a fair bit, and Greene was in coverage, but just didn't put two and two together. Similarly, safety Lorenzo Waters was pulled late, as Rutgers wanted to get a more experienced and coverage-oriented look on the field with backups Wayne Warren and Mason Robinson.