Land of the Giants two-fer:
"The Creed": A decent idea, the crew needing a giant doctor's help to operate on Barry. Implausible, though, since they operated in the forest without masks, so it's a wonder the kid didn't die of an infection afterward. And they flirted with making Betty relevant for once by having her be the closest thing they had to a medical expert, but of course she had to chicken out because she was just a weak, frightened female and the big strong male hero had to do it. Still, Paul Fix (Dr. Piper from Star Trek's second pilot) was surprisingly non-boring as the doctor.
The show is very inconsistent about language. Recently, they had that episode where the giant scientists had charts and labels written in alien script. Now, they explicitly speak and read English and can't read German. (And what a coincidence that it's in a language Fitzhugh knows.) And how do so many things from Earth keep crossing over to the giants' world? How do they have the Hippocratic Oath? Could it be that rifts between worlds have been opening for millennia? Could the parallels between worlds be because the giants' culture has actually been secretly, parasitically built on Earth knowledge all along? Could that be why the government is so eager to catch the Little People? That would've been an interesting idea to explore, if they'd actually been thinking in those terms.
"Double Cross": Fitzhugh participating in a heist is an interesting idea, but I wish they hadn't gone the amnesia route. The crooks captured the others as hostages anyway, so the script could've used that as Fitzhugh's motivation for helping -- or they could've had him go along willingly and recruit the others because there was something in it for them, like maybe they could use shavings from the ruby to repair the laser framizamicator in the ship's engine. Amnesia is just too easy. And I hate the TV trope of amnesia that can be toggled on and off by consecutive blows to the head. As if a second dose of head trauma can somehow fix the first one instead of making it worse.
The effects weren't very good either. There was that shot where the giants were clearly putting their hands on top of the table, but their hands disappeared behind the split-screen line. And some of the composite shots in the woods seemed to get the scale or perspective wrong, with the little people appearing too large relative to the giants.
And that first cop who appeared is terrible at his job. The curator of a museum full of valuable items finds that the front door is mysteriously unlocked, and the cop just shrugs it off rather than taking a precautionary look around?