1. At the very beginning, when the rocket was launching, the first stage was dropped before reaching Mach 1. This surprised me - I had the impression that most rockets reach Mach 1 well before 1st stage separation. Of course this might be just a property of this particular rocket, but it raised a question mark in my mind.

2. Time dilation - the characters in the movie talked about it as if there was some kind of a border, beyond which there is no time dilation. It doesn't work that way, it's like gravity: the closer you are to the black hole, the stronger it is, but it never disappears. Of course you can be far enough for the effect to be negligible, but it hasn't been said that way.

3. Tidal forces capable of causing such great waves, especially on an ocean that's only a few centimeters deep, should probably tear a human apart.

4. This is mentioned in several places on the Internet, but I have to mention it if the list is to be complete - the accretion disk around a black hole this big emits not only visible light, but also UV, X-rays and probably some gamma rays, and that in such quantities, that people wouldn't be able to survive anywhere near.

5. After Mann got killed and damaged the Endurance, some of the compartments around the main axis were destroyed. This means that it lost some symmetry, which should shift the center of mass away from the axis, not to mention the fact that it probably wouldn't be able to rotate around it without some pretty wild precession. This would make docking really impossible, exactly as the robot claimed.

6. I liked the fact that when flying near the black hole on the last part of the journey, they made use of the Oberth effect and fired the engines close to the black hole. What didn't make sense though is that the robot and Cooper detached from the ship *after* burning (how was the mass loss supposed to help them then?) and immediatly dropped into the black hole (suddenly by detaching they decelerated by a significant fraction of the speed of light?).

7. When Cooper was falling into the black hole, he had no trouble talking to Brand in real time, despite the fact that significant redshift should appear - so not only would he talk slower and slower, but also Brand would have to constantly adjust the receiving frequency to be able to hear what he says.

8. After Cooper fell into the black hole, everything went dark. This might already be in the regime where we don't really know what happens, but still it would be more reasonable to me if the light from outside wouldn't just disappear. (Of course what happens next is even stranger, but since it is kind of the point of the movie, it doesn't belong on this list.)