I don’t know if it was discussed before or not, but there is a continuity error in the movie.
On the Endor moon, when Luke talks to Leia, he says:

“Vader is here…now, on this moon.”
And then we see that he is not. He arrives when Luke is delivered to an imperial base.
From the script:

"EXT .FOREST - IMPERIAL LANDING PLATFORM
An Imperial shuttle floats down from the Death Star and lands gracefully on the huge platform.
Now, an Imperial walker approaches the platform from the darkness of the forest. The whole outpost - platform, walkers, military - looks particularly offensive in the midst of this verdant beauty.

EXT. IMPERIAL LANDING PLATFORM - LOWER DECK
Darth Vader walks down the ramp of the shuttle onto the platform, …"

Can this be fixed in this edit?