When the woman locks herself in the bathroom, she is seen lowering the toilet seat to sit down. When the gunmen break in the seat is raised.
When we see Imran getting ready near the beginning of the film, the rear flap on his turban changes between flapping loose and being tucked in.
David orders a burger at Shaman and is told that beef is banned in India. However the "beef ban" in Mumbai only came into effect in 2015. Before that beef was freely available in the city.
When the terrorists are shown arriving, they are on a small rubber boat, in reality they took over a fishermen boat and used it to come near the shore to avoid any problems.
In the Chambers room Zahra was shown speaking over the phone to her mother in Farsi while Farsi is not a language spoken India confusing Farsi spoken in Iran, Afghanistan and Tajikistan to Urdu spoken by Muslims in India and Pakistan.
The injured terrorist in the room where the hostages are held uses a hotel phone (landline) to call home to Pakistan and gets through on first attempt. He would have had to know how to get an outside line on a hotel phone, the country code for Pakistan, the area code for his village besides his families phone no. This is highly unlikely for somebody who is not acquainted with modern amenities, (even the WC causes consternation) and who would not have been trained or expected to communicate with anything other than the mobile phone they were provided with.
Head chef Oberoi is seen in first minutes trying a sauce with a spoon and then putting the same spoon back in the plate. That would never happen in a good hotel or by any chef. He would just throw it away and put an other spoon in the plate.