The technical term is "puffery", which the FTC defines as "exaggerations reasonably to be expected of a seller as to the degree of quality of his product, the truth or falsity of which cannot be precisely determined."
UI elements that expand and cover up other UI elements when you mouse over them.
"Flat" color schemes where you can't even tell where one UI element ends and the other begins.
Insisting on using custom widgets (buttons, etc.) instead of the system-provided ones. It doesn't matter which platform you're on, I guarantee the system-provided widgets are better at being widgets.
The potential for blackmail.