When Judy is caught in the mine field, the mines are obviously beach balls.
Mr. Keema's communication microphone (seen at about 19 minutes in) is actually a flashing fish tank light bulb.
Dr. Smith reveals his "astral signature so to speak" is Sagittarius.
The funny little turtle shaped robot used by the Taurons for environmental survey previously is a bit more colorful and being used to throw an explosive device.
The spaceship used by the frog alien is the same ship that has appeared in several other episodes, but decorated differently.