The robotic bird used in the movie was seen flying for hours, but in real life such type of robots can only make 10 minutes flight in one go.
No dogs barking in villages during surgical strike.
Indian Army officers are required to be clean shaved unless deputed at a remote site. Vihaan is shown going to his office in Delhi with a beard which not allowed and can lead to censure or dismissal.
A bird-like drone of the shown construction with inflexible wings would not work. The wing beat would have no effect and would not provide lift and propulsion to the drone. Furthermore, the drone would by no means be able to stationary hover.
Bullet shell casing drops make the same sound.
The young man who demonstrated bird drone was introduced as intern in agency. An intern is shown handling the non-commissioned drone in such an important mission.