When Mohan speaks to his colleague Vinod for the first time from postmaster's office in charanpur, the background shows daylight, also vinod's background shows broad daylight, however, due to geography, it should be night time, at one of the places.
in the beginning, when they are showing the names of directors and then show the name of the movie in English, Hindi and Urdu, they make an error in spelling "swades", they spell it in a way that it would sound "sodes". They missed the alphabet "alif"
In the scene when Mohan Bhargava installs turbine for electricity generation, the turbine's blades are seen as "forward curved". However with forward curved blades, losses are significantly high and normally they are not used in turbines. Sometimes where they are used, an additional pressure turbine is used, but that was not there in the movie.
Mohan directly attaches the plug in the AC socket for the foot massager he brought from USA. In reality the plug standards of USA and India are different and will not fit in other country's socket. An adapter must be used for compatibility.
In the beginning of the song "Yeh Raasta Hai"(after picking up the stranger en route to Charanpur), the song is shown as being played on the caravan's stereo. But in the shots of the media player, it doesn't display anything, indicating that it is actually not switched on.