It's a good TV series production, but it took the foreign thoughts about what happened in Constantinople / Istanbul. In some prospective, some points were odd and couldn't get it anymore, as history reader.
For example, The show appears people in Constantinople fight better than the Ottoman army, while Ottoman Army overcame Constantinople army by luck and prophecy based on the moon etc. But the fact that the Ottoman army (Muslims) fought very well, and there was one of the prophet Muhammad, peace be upon him, companions fighting in this battel. He is the one who jumped over the wall, and fought all the soldiers behind the wall, and he opened the gate for the Muslim army to enter into the city. His name is Euyp Sultan, who has a Mosque under his name with his grave in Istanbul today. [ you can visit the Mosque]