Thanks for taking a look @spikeyxxx .
So the crazy camera clipping differences are because this scene is actually part of a huge animation that follows the flying piece of paper across a huge landscape. There are several cameras in the full file and a lot of geometry/objects but I removed them for the file you downloaded to keep the file size down. I was having clipping issues in the render early on and I cranked the clipping values right up in the viewport temporarily and forgot to turn them down to a suitable level later on.
As for all the errors , most of them seem to relate to OBCHIMNEY_HAT which makes sense as I merged that object with the chimney to texture it last night (it was a collision object for the smoke) but I assumed that re-baking the smoke sim would sort any issues with the missing object.
Anyway , thanks again. I now believe the issue is because there have been other smoke sims in this scene from inside the house when the paper flies out of the window and you can see the fireplace and I think that even though they have been deleted when I saved this scene as a separate file for the exterior animation , there is still some data or bake present somewhere that is confusing Blender. I am going to append the objects to a brand new file with no existing sims and make the smoke again to see what happens.
