When Grace is making coffee while wearing that hat she picks up a sugar stick to put in the coffee. When we switch to her at the design table the sugar stick changes to a small milk tub into the coffee in mid sentence.
As Karen holds Grace's blueprints, the pages are stapled and she is holding them both. In the next shot one of the pages is hanging down loosely.
When Grace is showing Will her ideas for the bathroom, whenever she shows Will pages in her magazines, the pages they're on change between shots, and the magazines on the table differ from opened/closed.