Each mediam was made with the author who was well aware that they are different mediums, so the stories were adapted to each medium.
Bah! You are all wrong! For the REAL die-hard fan, get a hold of the radio scripts. They add a lot of commentary on how different things came about, how he was busy scribbling details right until air time, how he grabbed the janitor at the last second to play a part he just added in. The commentary is almost as funny as the script itself.
It describes how, at the end of one episode, he threw our heros out of a space lock and had the floating in open space with seconds to live.
He then goes on the discuss how he struggled for that next week trying to decide how to free them. Anything he came up with seemed to highly improbable.
So... he came up with the Improbability Drive (tm Sirius Cybernetics).
BTW: I agree, each medium was adapted as necessary. I enjoyed all of them. At first, the movie seemed a little too slapstick for my tastes, but it quickly grew on me. I think Douglas would have approved.