I can see two problems:
1 - the door - this seems to be a Sketchup model. When not all faces are textured, SH3D has problems similar to what we see. Make sure (using Sketchup) that your model has textures on all faces (inside and out) before exporting the model.
2 - black spots in ceiling lights - this is caused by light bulbs touching the ceiling. Lower the light bulbs and the black spots disappear.