Guinness themselves aren't exactly the masters of record keeping they like to make out. A lot of their bodybuilding records have been given to frauds (biggest biceps, biggest chest measurement). Their current world record holder for "longest mustache" doesn't have a particularly impressive amount of hair coming from his upper lip, but the two dreadlocks of dead hair stuck to his chin were enough to convince their adjudicators. The first half of king of kong showed the classic arcade community were already having problems with them over a decade ago. I know the speed running community has already pretty much abandoned Twin Galaxies due to various issues they had with them.