Topic summary
Glitches

Extracted from the Wikipedia article Glitch.
Video game glitches
Glitches in video games may include graphical and sound errors, collision detection problems, game crashes, and other issues. Quality assurance (QA) testers are commonly employed throughout the development process to find and report glitches to the programmers to be fixed, then potentially start over with a new build of the game. If insufficient bug fixes are performed, numerous glitches and bugs can make their way to the final product. Bethesda Softworks, for example, is notorious for the amount of glitches in their games, though some players even prefer them to a glitch-free experience.