Oddly, some graphics are missing in most versions of the game (and I'm not talking about the sun set effect).

- In the SCUMM bar, the pirate right at the door which you can talk to sits in mid air. Only the EGA and Amiga version has his chair drawn.

- On the ghost ship right of the creaking door, there is a sign. The hotspot is there, and you can read it in every version of the game, but only in the EGA version, the sign is actually visible.

Are those graphics hidden somewhere in the resources and just not displayed for some reason, or are they completely absent? Is there any way to fix this?

That would depend on if these objects are sprites or part of the background images.

Try this to view all the sprites:

http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Viewers/LucasRipper.shtml)

Those particular graphic errors are all fixed in my v0.8 beta patch.

And unfortunately, the LucasRipper misses frames on many costumes.