Gray areas - skills we want/semi-expect our students to have that aren't necessarily taught or part of a specific curriculum (so, we assume they know or have it; often end up asking, "shouldn't they have learned that in such-and-such class/grade?!")
Intangibles - outcomes, considerations, other skills not intended or planned but likely
Compartmentalization - subjects taught in isolation
Desegregation - process of overlapping skills/content (in other words, cross-curricular lessons or integrated learning)
Dark side - assessment. Not going there today :)
Additionally, school structure - I'm not an expert nor am I powerful; there are some things that can't be changed easily regarding school structure, so we have to get creative
Let's see a little more about "transdisciplinary" work.
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Brainstorm spaces like Padlet and RealTime Whiteboard allow users to contribute simultaneously (like using Google Docs)