This page from Pirate Gold is unclear on how the door is "sealed" that Captain Dennis bursts open simply by throwing his powerful shoulder into it. It could have been locked, or perhaps bolted from the other side. Perhaps it was literally sealed, with wax poured into the cracks. Regardless, even a non-Superhero has a mechanic for wrecking doors. Once found in Book II: Mobsters & Trophies, at the back, this rule has gravitated to Book III: Underworld & Metropolis Adventures in 1.5 edition and will surely return in some form in 2nd edition.
There are some things done in comic books, for the expediency of the story, that should probably not happen in a RPG scenario -- like this move, to wrap up a fight scene faster. Normally, it should not be possible to tip over a giant vase, roll it towards a cluster of five hoodlums, and knock them down like bowling pins. It's not really fair to the other players who are playing by the rules and getting their 1-2 attacks per turn.
That said, a Fighter using combat machine might be able to get five attacks per turn, as could a Superhero using the Flurry of Blows power. Describing all those attacks as one attack is within the Editor's purview for describing the scene in flavor text.
Also, in a campaign with a really light mood, the Editor would have more latitude for allowing attacks with comic effect that are a bit outside the rules.
According to this page from Radio Squad, radio broadcasting apparatus was portable enough to fit in the trunk of your car back in 1938. Good for parties, or fooling the police with false broadcasts!
At a cursory glance, it might look like Bob Merritt here has turned completely bonkers. Charging in broad daylight a transport plane surrounded by hoodlums with guns, enjoying cover? Well, depending on his distance to the plane, it maybe wasn't such a bad plan. If Bob could have sprinted to the plane in the first phase of movement, he could have kept the plane between him and maybe half the hoodlums and cut the number he had to fight in half. Because he didn't make it in the first phase -- perhaps having misjudged the distance -- his opponents were able to get off their missile fire before the next movement phase.
Of course, the Editor could still have ruled that, even if Bob could technically have made it in the first movement phase, that his opponents were set up and ready for him and that at least some of them could get off their shots early while he was still moving.
(Scans courtesy of Comic Book Plus)