My favorites are designers who think the Clear Form button should be to the left of the Submit button. I mean, bad enough to have the opportunity to wipe out everything I just typed, but why make it that easy?
If I spend time filling out a form, why would I want to clear it? If I make an error, I'll correct it - not start anew. When I see a "clear form" button nowadays it's a big red flag that the owner of the site is still stuck in the 90s usabilitywise.