In the DVD commentary for this episode Wesley Eure (Will) and Kathy Coleman (Holly) mention that the Sleestak are over ten feet tall and many were played by professional basketball players.
When Rick falls into the pit, you see him bounce off of a tarp under the fog.
Will: Maybe the Sleestak have some good in them after all.
Rick: Everything has some good in it, son. All you have to do is just look for it.
In this episode we learn that once in a while a Sleestak is born with all their ancestors knowledge. We also learn that controlling the matrix tables are not part of that knowledge. This is the first suggestion that the Land of The Lost Pocket Universe was not created by the Sleestak ancestors.
If the voice of S'latch (Ralph James) sounds familiar, he was also the voice of Orson, whom Mork reported to at the end of every episode of Mork & Mindy.