Interstellar - less than stellar (spoilers!)

I am pretty sure that an astronaut who falls into a black hole would not end up behind the bookshelf of his daughter - even if it turns out that the bookshelf is actually part of a 5-dimensional lattice.
So where exactly was the physics expertise of Kip Thorne used in this movie? Was it in the scene where sparks appear in the black hole, which rip the spacecraft apart but leave the spacesuit of the astronaut intact? Or was it in an earlier scene, when the spaceship takes off from the water planet? Supposedly gravitation was really strong there, so the rocket engines had to be quite powerful - but they left only a few ripples on the water. (Btw Newton's law of action and reaction was mentioned later.) This takeoff looked to me like a scene from Star Trek and I am talking about the 1960s tv series. And the earlier trip through the wormhole was Star Trek quality too imho.
Btw the whole sequence about Dr. Mann could have been cut out without any loss of precious quantum information, which would have accelerated the plot and spared us from watching Matt Damon's acting skills.
So here I am, left to wonder about the nature of space-time and in particular where those 3 hours went that I wasted with this movie. I am afraid that I will not find them behind my bookshelf.