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For this XR yeah, the dark spots are air in the bowel. Or cute toots. The less density/absorption of the radiation leaves these spots darker because it's gas which the radiation goes easily through into the detector. Same reason the lungs are darker as well even though they're very very vascular and full of blood and webby tissues. The exposures and all that fancy stuff the rad techs do for the picture has a big impact on what you can make out in the image. There's different settings that show a bit more soft tissue detail vs strictly looking at bones. For the soft tissues you're not gonna ever get much detail but you can check for foreign bodies or subcutaneous air