It is explained that Ant-Man shrinks by reducing the distance between his atoms. So he still consists of the same atoms after shrinking, which means he still should have the same mass, but then somehow ants can still carry him. He later shrinks to subatomic size. How on earth can you become smaller than atoms if you are made of atoms? He then hears his daughter talking while still on the subatomic level, what particles propagate the sound waves to his ears? Quite poor attention to detail in some of the physical areas :(

On the other hand, the characters besides the villain (step up yo game, Marvel...) were pretty great. And it overall it was a pretty fun movie.

BTW, the scene which reused the new S.H.I.E.L.D. base scenery from Avengers 2 in combination with only one single actor besides the Ant-Man seemed hilariously cheap.