There are quite a few examples, but here's two that have affected me 1)pstcol has to be loaded before graphicx (I forget the reason but it just does) 2) if I

There are quite a few examples, but here's two that have affected me 1)pstcol has to be loaded before graphicx (I forget the reason but it just does) 2) if I use pdftricks I have to unset the "clipbox" command because it conflicts with the one in adjustbox. As you say in another comment, given how latex reports errors debugging these can be a Fun time.