First appearance of the Space Pod
The "lock" on the alien's jail cell is actually a Grote #222 automotive lamp.
When the aliens enter the J2 and open the accordion door to Penny's and Judy's bedroom the exact same background screen is shown when they next enter Will's bedroom.
The alien ship is the same one used in The Derelict. This is reused black and white footage of the alien ship and the approach to it.
Some of the consoles and panels used in the alien ship are parts of the Time Tunnel. The unit located below the CRT screen is an EICO Model 377 Audio Signal Generator normally used for hi-fi and stereo repair and servicing.