Bodies should be covered unless they are actively being worked on by students (both out of respect and to preserve the cadaver). The optics of having 'random' people routinely parade past uncovered cadavers isn't pretty from a PR perspective, so some schools do not lead interviewees through the cadaver room if the cadavers are uncovered.
Many things that are deemed important by applicants (student-to-cadaver ratio, "curricular innovations", and state of the educational facilities, etc) are discussed and shown during the interview day to attract the best possible class. The things that are actually important to know though are usually not discussed in much detail: distribution of experiences and autonomy during clinical rotations, prevalence of learner mistreatment, 'safety net' mechanisms in place for struggling students, overall preparedness for residency, etc.
To add: make an effort to talk to 3rd and 4th years about their experiences before making a final decision on where to matriculate. The experience of 1st and 2nd years, while well-meaning, usually is not as helpful.