I have noticed some vfx that were a bit odd. Hell, 2 in particular disappeared completely. In The Schizoid Man (I think), Picard is looking at some holographic solar system observing one planets orbit being very skewed. The final scence involving this shot has the hologram disappearing from screen a split second before changing camera angles. But, you can still hear the sound effect as though it was still on Picards desk.
In Unnatural Selection, the last shot of the medical station shows what appears to be a flowing river in the background. Again, just before the shot changes, the river stops flowing, the effect gone.
Lastly, in Up the Long Ladder, was it really necessary to show the shadow of the Enterprise on the planets rings? It didn't make any sense to me, but whatever.
Now i'm nitpicking. :-) I am enjoying the season, though!