When the robot lands on the junkyard planet in the pod it is night. When we see the J2 land it is now day. When the John and Don immediately exit the J2 it is now night again although only a short period of time has passed.
When they J2 lands on the Junk planet, it makes a hard landing without using its landing gear. However, when the Junkman and Dr. Smith later take off they retract the landing gear shortly after lift off which should not have been necessary.
When Smith and the Junkman are arguing as the Junkman flies the J2, the Junkman's skull cap switches between fully down on Marcel Hillaire's head in the close-up shots and shoved a few inches up and back on his head in the long shots.
The J2 makes a hard landing with the landing gear retracted and the miniature model is shown settling and resting on the lower spinning light section. When the scene switches to the planet surface set, the ship is buried up to the level just below the upper deck exit hatch, allowing the show to re-use the existing "crashed into the dirt" exterior set.
When the Junkman is first seen, he says he's never heard of Earth. Later he offers Dr. Smith a common Earth meal, Beef Stroganoff.
The robot which is hanging upside down by the Junk planet's magnet is obviously a stunt double robot. Most notably is the large access panel and numerous dents on the back of the robot's upper body whereas the hero robot's is smooth and without a visible access panel on the back.
At 9.33 a string is visible which pulls a canister down a ramp.
The ladder access to the lower deck is no longer present. Professor Robinson, Dr. Smith, and Will are now emerging and exiting the upper deck through a "new" access on the set, which apparently leads to the lower deck(s).