Hampden Park organisers
Kicking off your first Olympic Games in almost 70 years by getting a nation's flag wrong is bad enough, but when the mix-up is between two countries that are officially still at war, you're in gold medal territory. The North Korean women's football team walked off the pitch at Hampden Park in Glasgow when their players were introduced to the crowd alongside the banner of the Republic of Korea.
Bangalore student Madhura Nagendra was among the volunteers who helped out at the Olympic Opening Ceremony but got a little carried away and decided to take part, joining the Indian athletes as they marched around the stadium. After angry Indian team officials demanded an apology, Nagendra admitted she had made "an error of judgement".
Along with every gold medal-winning member of Team GB, cyclist Laura Trott was entitled to a gold postbox in her home town. So when Royal Mail repainted a pillar box in Harlow, Essex, rather than Cheshunt, Hertfordshire, where she'd grown up, Trott rallied her Twitter followers to alert them to the error. She now joins Andy Murray (Dunblane and Wimbledon) as one of the only two British athletes with a pair of gold post boxes.