No matter how hard developers and quality assurance staff try, glitches are a normal part of gaming. They're unavoidable, but also potentially entertaining - after all, finding quirky moments and areas in game worlds can be highlights of a gaming experience.
It can be fun learning about the range of glitches in classic games, which is why we've shared various videos from A+Start - the YouTube channel picks apart classic games to find unexpected moments and code slip-ups that add a new perspective on games. Now the channel's tackled the much loved Paper Mario: The Thousand-Year Door and picked out 20 coding snafus - there's the usual mix of weird instances, many of which involve characters clipping through objects or falling through the world.
A wonderful game but, like every title, not absolutely perfect.