I remember back in the 80s when arcade games were huge.
Zaxxon had glitches like crazy ( the background was just wallpaper).
Sometimes you can even go through the ghosts in PacMan.
When the Atari 2600 started comming out with arcade games ( death of the arcade game business) there were alot of games that had glitches.
I know some today have things like that on purpose,, theyre called Easter Eggs.
In Resident Evil 4 for PS2,, you can do cirtain things that will make some puzles solve themselves.
My son Nick does it alot to show off.