Zack Morris is very clever. Once again, he devises a plan (that actually works.)
I enjoy seeing the cast younger, considering Jessie & Kelly are seen more frequently. The jokes were funny, like the one about Mr. Belding's sports car and how he planned to fit the split personalities in. The one about the compass for wen Lisa tells Screech to get lost is probably the most notable of the episode. It was quite unusual for Zack to plan a party in Belding's office. The plotline of everyone getting stuck in detention is hilarious, especially with Zack's immitation on the loudspeaker.
Well done plot, good jokes.