Lydia, I appreciate all you said, but find myself with absolutely nothing to contribute to any of it, for which I hang my head in shame.
In the ending to this episode, we have the biggest difference ever between the cliffhanger and the teaser redo the next day. Many redos have differences in how a scene was staged, how lines were acted... but here the event happens differently. In fact, the two versions of this scene are not reconcilable, and may indicate a change in the producers' minds about what was going to happen to the Guthrie character. Or it was just sloppiness.
You'll all probably think I'm making too much out of this. In the ending to this episode though, Guthrie is being affected by Laura in the Drawing Room, after just having been threatened by her. He stumbles around, alone, calls for Vicki... but no Vicki. After a struggle to remain well and conscious, he finally collapses on the floor, alone and without help, to the left of the fireplace. The end. He appears to have successfully been given the Liz treatment, since no one was there to help. Compare this to the redo...
One possibility is that the "redo" is actually a new scene, taking place later. I'll save all that for #176, though.