I noticed in S04E01 "The Best Of Both Worlds: Part 2" (at 08:20 when Riker and Worf enter the turbolift), there is a black opening at the end of the hallway, however when they reach engineering there is a orange door on the end of the hallway, indicating they've reached another section of the ship and a different decor. How did they achieve this?
Did they have an actual lift mechanism? Did they turn it around? Did they quickly change decor while they where filming the scene? Note that the scene in question was continuous and did not use the "freeze" command as used in some other scenes (h/t to @Zeiss Ikon)