Nutloose - Reef the VC10. I've used this to exit and enter the aircraft in the absence of steps on more than one occasion. Also, it was possible to get into the rear cargo hold through a door between the rear toilets into the 'boiler room' on the ones that weren't converted to tankers. In the film 'Catch me if you Can', Frank Abignale was seen to escape from a B707 through a toilet at JFK. This would have been impossible. In the book, he mentions it was actually a VC10 where it would have been quite possible, although quite a long drop from the rear cargo hatch.
I can also confirm the Airbus A300, A310, A330, A340 and the B747 have doors from the radio electrics bay into the forward baggage hold.