Land of the Giants: "The Golden Cage" was pretty good. They are encountering fellow Earthlings way too regularly of late, but this turned out to be an interestingly dark and creepy sci-fi story about a captive who'd known nothing but captivity for so long that she was happy as a lab rat. Celeste Yarnall was lovely as Marna, though maybe a bit too seductive for a young woman who'd never met a human male before. (I guess she could've been trained to act that way by her keepers, though.) The interplay among the cast was good too, though I'm not sure how in character it was for Mark to suddenly be the bleeding heart and Steve the cold pragmatist.
The Time Tunnel: "Secret Weapon" was an interesting change of pace, a spy story over an interval of just 12 years from past to present. Of course it was a bit simplistic in its portrayal of Iron Curtain baddies (who came from the same homeland as so many communist villains in '60s TV, the nation of My Country), and its attempt at Cyrillic lettering was laughable (mostly just backward or upside-down Roman letters, or random Cyrillic jumbles), and I think it passed off a shot of Istanbul as an "Eastern European" city. But it was a change of pace from the usual mucking about in history, instead going for a story about the time travel arms race, Tunnel vs. Tunnel. Which makes this episode unusual in its lack of dependence on stock footage; it saved money instead by being a bottle show, set mostly on a redress of the Time Tunnel set itself.
The timing of the opening is confusing. The travelers get a message from the Tunnel crew within a minute or two of their arrival in 1956. But the Tic-Toc crew doesn't know in advance where they'll end up, and surely they couldn't have sent them there deliberately. It would've taken them a lot more time to arrange with the government to send those messages. Although, granted, we have seen that the Tunnel crew can move their time lock forward or backward. So even if it took them hours to set up this plan with the government, I suppose it's possible that they could've moved the time lock back to just after Doug & Tony arrived and sent the messages there. Still, that seems like a stretch.
In addition to possible plot holes, there are a couple of bloopers: In one scene midway through, Whit Bissell addresses Lee Meriwether as "Lee" instead of "Ann." There's also a later shot where we hear Tony speak a line but his lips don't move. And when Ray puts the message probe in the Tunnel, his shadow on the rear wall spoils the forced-perspective illusion, a mistake the directors on this show make frequently. On the plus side, though,we get an unusual side angle of the Time Tunnel and its display window showing a scene from the past.