Unless I’m misremembering, A New Hope kind of glosses over how exactly Luke, Han and the others manage to get from inside the Falcon in the Deathstar hangar bay over to the adjoining hallway in order to enter that small console room. Luke and Han were disguised as Stormtroopers, but how did they get Obi-Wan, the two droids, and a giant Wookie, out of the Falcon and through the open hangar bay in full view of any number of cameras or nearby guards?
Oh crap, did I just nitpick the Original Trilogy? That’s at least seven lashes.
My thought is that the imperials already searched the Falcon, and the two stormtroopers that were directly guarding the ship were the ones they called inside, then replaced. So the other people in the hangar bay weren’t really looking for them and they might be able to sneak by. They get the officer directly overlooking the hangar to turn away with the TK421 thing.