Bingowings said:

The sets were largely a collage of bits left over from the other films and photographed with very little sense of cinema (compare Jerjerrod's control room to Tarkin's in ANH, there are 1970's Doctor Who sets that look practically the same, no wonder most of the footage ended up on the cutting room floor).

I'm surprised nothing thrown into the dumpster after Star Wars wrapped ever ended up in a Dr. Who episode.

I freaked out a little when I spotted a 2001 spacesuit backpack being used as set decoration in one of the Jon Pertwee era episodes. Kubrick would have done a spit take had he seen that! ;)