Just before Will reaches the fishing hole, you can hear him quietly singing lyrics from the show's theme song.
When the Marshall's trap a pig, they act as if they've never seen one in the Land of the Lost before, but in the previous episode "Fair Trade", they captured one and used it to trade to the Sleestak to save Rick's life.
Watch when they show a closeup of Sa's hand holding a candy bar. For being a wild ape-like being, she sure has perfectly manicured fingernails.
This episode introduces the Skulls of the Ancient Ones.
According to this episode the land of the lost relies on beings that fall into a mysterious hole for energy to keep it alive.
Ta is the only Paku to appear in this episode.
Holly recalls a neighbor from back home named Mrs. Feeney who had a dog.
It's revealed in this episode that Rick Marshall is from Indianapolis, Indiana. He attended Fillmore High; Mr. Javelin was the boy's principal, and Mrs. Turner was the girl's principal. He prefers his eggs over easy.
At the end of the episode, when the Marshalls duck behind some rocks, you can see Rick's shadow on what is supposed to be the blue sky.
The carrots and turnip Holly hands her father are normal-sized, instead of the two-foot vegetables they harvested in "Tag Team". Either this was a goof, or the drought has made the pickings mighty shrimpy.
When Big Alice and Grumpy are fighting in the Lost City, Big Alice knocks over one of the stone pillars, but after the Marshalls run out of the cave, the pillar is standing again.
When Cha-ka is in the pylon, you can see what looks like an electrical cord next to the matrix table (most likely for the light inside to make the crystals glow)
When Enik walks out of the Marshalls' cave at the end of the episode, you can see his shadow on what is supposed to be the sky (but is really just a blue backdrop)
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.
Enik was originally going to be called Eneg which is Gene spelled backwards (in honor of Gene Roddenberry) by writer Walter (Chekov) Koenig but the producers changed this as too obvious.
After they get in the Cave, Holly's pants turn from red to black. Near the end, when they follow the soldier out of the cave, they're red again.
When Dopey is chasing them, Will's leg, even though he is in front of Dopey, is behind Dopey.
What are the Sleestak doing out in broad daylight? They are supposed to be afraid of bright light.