Screech says that his Grandfather Powers has died, but he will later appear in Saved by the Bell: The New Class.
Toward the end of the story, Zack, Slater, and Screech, are on a plane gearing up to jump in an act of skydiving. All three men have never skydived before. This would therefore be their first-time skydiving. First-time skydivers cannot skydive on their own. In general, one can skydive with their own parachute, but only when accompanied by two professionals - referred to as AFF Skydiving.