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.
Rick: (holding Sleestak bones) Do you know what these are?
Collie: Sure. First year I was here, shot three of 'em. Biggest dang yankees ya ever saw. They weren't bad, though - tasted a whole lot like lobster. But yet again, not like lobster if ya know what I mean. Course, they don't bother me much...anymore.
Rick: Well the next one you see might shoot back. They have crossbows - and they think we taste good too.
Collie(referring to his cannon): Ol Sherry here, she don't talk much, but when she do, you better listen!
This episode features the first indication that the Land of the Lost is an enclosed or pocket universe since the river that flows out of one end of the land emerges from a waterfall on the other. In a later episode the Marshalls climb to the mountains on the edge of the land and by using binoculars can see their backs on the other.
This is the first appearance and use of the crystals. Red and green can produce a bright light, and can create a blinding flash if combined with a yellow.