Bug: If you put on the Lugia mask, it has a long nose on the front. If you put on the Team Skull face mask under it, suddenly the Lugia mask is cut in half with most of the snout and nose missing. Despite the Skull Face Mask not interfering with the Lugia mask at all, they don't even touch. No other mask or face accessory causes this to happen with the Lugia mask.
Bug: When viewing your Buddy Pokemon from your character screen, if you spin the Pokemon around or turn him while running your finger down over his candy to go to your stats page for him, sometimes it causes an animation error. Where the Pokemon will be duplicated and standing inside itself at the top, usually in different positions from each other slightly or animations lagging behind on one just barely.
