We all have regrets from our college years — Peter Engel’s just happen to be from Zack Morris’ time on campus. During a recent conversation about Engel’s impressive and nostalgia-inducing resume, the author of “I Was Saved By the Bell” told TheWrap the one thing he would take back from the franchise’s less-successful “College Years,” which only lasted 19 episodes as a freshman series. “I should’ve taken all the six kids to college,” the executive producer admitted. “I should’ve insisted we take them all and I didn’t. It was my decision and I made a mistake.