What's the difference between the old gullwing Mercedes Benz and the new SLS AMG doors?

The engineers were are not allowed to make gull wing doors like they did in the 50's... it's a kinder-softer-gentler time in the world of cars, and if a driver flipped a new gullwing on the roof, they wouldn't be able to get out.

The SLS AMG has exploding bolts at the door hinges.

Source: Automobile Magazine April 2010 issue, Ezra Dyer article page 30