Pay close attention to all aspects of the video.

Source: Lakshmi Chandran + Midhun Mohan + Nidhin Joseph

Did you notice if there was anything that changed in the video? At least five things changed in the video: the colour of the lighter, the order of the book arrangement, the placement of the chess pieces, the cup on the side, and finally, the colour of the placemat itself. However, one could not have noticed all of these changes. This is known as change blindness.

Here is the video displaying all these changes.
Source: Lakshmi Chandran + Midhun Mohan + Nidhin Joseph

Failures of visual awareness are prominent in both change blindness and inattentional blindness. The failure to recognize a clear shift is known as change blindness, whereas the failure to recognize the presence of an unexpected item is known as inattentional blindness. We miss out on something readily apparent in each instance as we do not know where to search for it. 

Change blindness is the inability to recognize changes in a scene. It is more common than we imagine. This inability to recognize a change in movies is a typical occurrence. Popular movies frequently feature scenes where a crucial element that ought to stay the same shifts from one shot to the next, much like things in real life. These modifications in movies, known as continuity errors, are picked up by viewers seeking them, typically by seeing the movie more than once. However, spectators in cinemas who are not looking for these faults usually miss them.