In version 1.31, when I go to the page Special:CiteThisPage, there are two error messages displayed on the page before I have a chance to enter anything into the input box. Maybe these messages are intended to be instructions to the user as to how to use the page, but the way the messages are displayed, it looks like error messages. If these messages are intentional, I would like to suggest removing the first message since it appears before any data has been entered into the input box.
Topic on Extension talk:CiteThisPage/Flow
Good spot. Normally people arrive at the pre-filled target from the side bar, so it's less of an issue, but we don't currently have a way to fix it without damaging the UX in other ways. I've filed T213317 for this.