As I recall the movie was pretty close except the depiction of the Astronauts. Howard turned them into his typical Hollywood piers. In actually they were very conservative and never used any course language not because they were prudes but because they were professionals.
At least, not in the presence and hearing of ladies. Amongst themselves ...
Are you a Turtle?
And then, of course, there's that great paragon of conservatism in the Senate, John Glenn.
Those who worked at NASA then were also critical of Ron Howard for trying to put blame on firms working with NASA.