Maybe he could watch with his real-life buddy, former co-star Tiffany Thiessen, and she could maybe help his memory out a little.
(For the record, he does remember enough to be regretful about one particular SBTB episode.)
But if he wanted to find something fun to spend his time with, Mark-Paul Gosselaar could do worse than watching the shortform series Zack Morris is Trash, which is a brilliant look at just how morally corrupt the blonde teen was during his Bayside years.