I just re-watched that approach and fly-over sequence again last night and now find the lightning bolts rear-projected on a screen to be so obvious that the effect is now a bit diminished. I never thought about it before, but upon reading that description, I can't help but look at it and see how flat the effect is.
Well, I know what you mean. There's no such thing as a perfect special/visual effect. Aside from ubiquitous mattte fringes, there are various anomalies and artefacts in the film's effects work. For example, the transporter beam is kinda cheap-looking, and if you look closely, you'll see that it isn't totally aligned with the overhead ring and pad in
this shot, while the Earth bleeds through the Enterprise's starboard nacelle in
this shot. The former of those shots also exhibits the scar of incomplete effects work (per
The God Thing: those windows were originally blue screen and were meant to be filled in with something interesting, but they ran out of time and just blacked the windows out).
That's a DE shot!
Bleerrgh.
Errrrgh.
*puke*