At time 18:40 (camera inside) Shaurya open the door of apartment with key from inside but didn't put it in his pocket.But in next continuous Cut (camera outside) it's shown that key is already in his pocket.
While the protagonist spends a incredible amount of time trying to open the door via breaking off the door handle and trying to jimmy the key entry point with various tools when tying to escape, he does not even attempt to remove the butt hinge on the door, which could easily be dismantled with what he had available to him. Especially in a new building. Older versions can rust and jam over time or with various coats of paint, but the ones visible on the doors were new and would have easily come apart.
Shaurya throws a TV set out of desperation to attract the security guard's attention.
However, the guard does not notice the TV set since he is shown to be too busy.
The TV set is shown to be lying on the ground near the building lobby.
Later, when Shaurya finally manages to escape, as he exits the building lobby,
the TV set is nowhere to be seen. It is conspicuous by its absence.