Footage from Star Trek III was reused in the Star Trek: The Next Generation’s “11001001” to represent an enormous spacedock. The Enterprise-D was simply superimposed over the motion-picture Enterprise, implying this facility was at least twice the size of the Earth Spacedock seen in the movies.
Andrew Probert, who was the show’s senior illustrator at the time, hated it.
He told Greg Taylor of Trekplace in 2005:
Going into the spacedock was ludicrous and I was fighting tooth and nail to get them to not do that. The producers simply shrugged their shoulders and said, “Well, we’ll say it’s a bigger spacedock,” but that logic really didn’t work for me. The system that I proposed was that the Enterprise to be serviced and docked on the existing space station exterior, because it has an umbrella-like rim — a mushroom head, if you will — under which the Enterprise could have been docked by connecting the dorsal replenishment systems, but… There’s a lot of things that sort of fell by the wayside and it is what it is.
Probert produced a matte painting for the docked Enterprise-D. A photographic matte was added to the shot in order to show people walking through a gangway tunnel.