Mario Lopez, 46, and Mark-Paul Gosselaar, 46 — aired on NBC from 1989 to 1993, and saw a sequel series called “Saved by the Bell: The College Years,” which aired from 1993 to 1994.More than three decades later, there will be some changes to the big return to Bayside High. For one, the original show’s studio audience and canned laughter will be nixed.