Things You May Not Understand While Watching the Movie 'INTERSTELLAR'

The Ghost which Murphy speak about in her child age

In folklore and parapsychology, A Poltergeist (German for "noisy ghost") is a type of ghost or other supernatural being supposedly responsible for physical disturbances such as loud noises and objects moved around or destroyed. Most accounts of poltergeists describe movement or levitation of objects, such as furniture and cutlery, or noises such as knocking on doors. Poltergeists have also been claimed to be capable of pinching, biting, hitting and tripping people.

The topological space which the spaceship enters in order to heads Miller's Planet
Wormhole, officially known as an Einstein–Rosen bridge, is a hypothetical topological feature of spacetime that would fundamentally be a short cut through spacetime. A wormhole is much like a tunnel with two ends, each in separate points in spacetime.

The Endurance Mission was about to collect astronaut data from one of the three planets orbiting the Black Hole Gargantua

A Black hole is a region of spacetime from which gravity prevents anything, including light, from escaping. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon.

The reason for Cooper and crew lost 24 years by spending some hours in the Miller's Planet

In the theory of relativity, Time Dilation is an actual difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from gravitational masses.
An accurate clock at rest with respect to one observer may be measured to tick at a different rate when compared to a second observer's own equally accurate clocks. This effect arises neither from technical aspects of the clocks nor from the fact that signals need time to propagate, but from the nature of spacetime itself.

The constant which Dr. Brand tried in his whole life to solve the problem of Gravity in Earth

A gravitational singularity or spacetime singularity is a location where the quantities that are used to measure the gravitational field become infinite in a way that does not depend on the coordinate system. These quantities are the scalar invariant curvatures of spacetime, which includes a measure of the density of matter.

The Space which Cooper enters while crossing the Black Hole

In geometry, the Tesseract, also called an 8-cell or regular octachoron or cubic prism, is the four-dimensional analog of the cube; the tesseract is to the cube as the cube is to the square. Just as the surface of the cube consists of 6 square faces, the hypersurface of the tesseract consists of 8 cubical cells. The tesseract is one of the six convex regular 4-polytopes.

The Code which Cooper communicate with Murphy when he was in 5-D Space

Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. The International Morse Code[1] encodes the ISO basic Latin alphabet, some extra Latin letters, the Arabic numerals and a small set of punctuation and procedural signals as standardized sequences of short and long signals called "dots" and "dashes" or "dits" and "dahs". Because many non-English natural languages use more than the 26 Roman letters, extensions to the Morse alphabet exist for those languages.