Well, it never hurts to try i guess (or try to guess in this case). I initially thought that you were referring to a door on the top of the fuselage right behind the gunner's station and not the blisters to the sides, so that's all i could come up with. Of course there's no visible outline for a top fuselage door because it doesn't exist, but then again i totally missed the blisters that do in fact exist, so my thoughts started running a bit wild on the whole matter
So, if the pressure regulating blisters were the significant historic feature, what are the 3 detail errors mentioned in the title?
Interesting information in any case, keep it coming. I know i'm not the only one who's extra-curious to see a photo of those blisters in operation
