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

Problem:
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.

Solution:
The SLS AMG has exploding bolts at the door hinges.

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