-One where deletion causes statuses to lose track of where they are in timelines, so subsequent deletion and other actions are performed on the wrong status.
-It's was possible to infinitely open copies of the same thread, account page, and tag page by just continuously clicking on the status, avatar, or hash tag respectively.
Mentions are also, incidentally, but still link to the account page for that user in the browser. This should be changed to an in-app account page when that's finished, but it's actually fairly suitable fallback behaviour for now.