[math-fun] Math museum error?

Does anyone know anything about this? http://www.dailymail.co.uk/news/article-3152858/Teen-catches-math-error-gold... The press release (sounding more political than mathematical) asserts that the way the Museum presents the Golden Ratio in its exhibit "is in fact the less common - but no less accurate - way to present it". So, what was the "mistake" in the Eames exhibit, and was it in fact a mistake? The newspaper story doesn't give details. Jim Propp