Where did the Earthlings get a periscope and a laser drill? Neither of these were seen in any first-season episodes, and would have been handy in a few of those.
Within walking distance: a drug store
50-year technology gap: A working "hydraulic" robot
Why does Professor Gorn have a weasel in his laboratory? He even tells Mark earlier he's not really interested in biological experimentation.
(tall-telling for the giants)
Fitzhugh: The woman is known only as "Betty." Truly the Devil's handmaiden.
Fitzhugh: Barry, I guess sometimes I don't know what I'm talking about.
Steve: Mark's too much. Give him some tools and he'll fix anything.
(asking about Fitzhugh)
Professor Gorn: What does he do?
Mark: The same as the rest of us - survive.
For the second season premiere, John Williams comes up with a new opening theme, and the opening credits are redone to include clips from the show that eventually form the letters "Land of the Giants". The credit listing of the actors remains the same, although there are different (and more flattering) shots of the actors involved. Ms. Lund even wakes up for her new credit shot!
Clips from the new opening are: 1) The Spindrift flying into the space warp, 2) Dan and Steve being passed over by a car, 3) Fitzhugh and Barry being attacked by a giant cat (all from "The Crash"), 4) Steve fending off a giant hand (from "The Weird World") and 5) Steve fending off a giant gopher with a flare (from "The Weird World"). The clips fill in the words "Land of the Giants", going counter-clockwise from "the" ("Land" is above "of the" above "Giants").
Mark, Valerie, and Betty get new wardrobes. Betty's is substantially...baggier, to conceal her pregnancy.
Due to her pregnancy, Heather Young (Betty) is absent from a number of episodes, and appears only briefly in many more. In the latter she is usually concealed by foilage or loose clothing so that her condition isn't noticeable.
This episode marks the first use of the laser torch and the periscope.