The NFL takes over stadium operations during a superbowl. They bring in their own staff and they’re much more rigorous than normal event staff.

I wouldn’t play with national events like the superbowl. I think even minor mischief can bring you legal trouble for years.

With that said during normal events the employee entrance is usually easier to get into. At least one stadium I was at cared more about you when leaving than entering. They wanted to catch thives.