SPOILER ALERT So im going to talk about specific things in the film, if you haven't seen it and want to, don't read the post below.
If you don't mind me asking is there anything specific that comes to mind? The movie was written along with Kip Thorn who is a major physicist. Also i read into and researched a lot of the topics and many scientists' were, for the most part happy with the science of the film. Practically we cant do most of what occurs but theoretically many scientists think that a lot of it is possible.
For example, time dilation, is a very real thing that we can measure here on earth so the scene where they are on the first planet, the time dilation is very possible.
Wormholes also are theoretically possible, the cryo-sleep stuff im not very sure about, I did think that the black hole scene at the end was a bit off, but if the black hole is massive enough its possible to go through it for a bit before all the fun stuff starts to happen.
The stuff that occurred in the black hole is not really something we can comment on either way, even theoretically with our current understanding of physics, especially if they are being of a higher dimension because they may have a different set of laws of physics then we do as well as advanced technology.