Raavan carried Mata Sita off to Lanka on his "pushpak viman" and not a giant bat.
Vibhishana was exiled by Ravana for continuously insisting on making peace with Lord Ram, he did not just walk out on his own.
Lord Ram, Mata Sita and Lord Lakshman accepted the clothes of "Sanyasa order" which formed the fourth limb of Ashram Dharma in Varnashram Dharma when they were sent in exile. They accepted saffron clothes signifying purity and detachment. Mata Sita never wore exotically designed saree of different colors as depicted in the movie. Neither did Lord Ram and Lakshman wear leather suits.
"Vanara" race as mentioned in the Ramayana was a species of human-like beings and not monkeys as depicted in the movie.
Lanka is a flying island in Valmiki's Ramayan and not some exotic holiday destination of graphite-constructed buildings and towers.
In the visuals of "Tu Hai Sheetal Dhaara" reflection of Janaki does not movie in a particular shot.
In the introduction scene of Lankesh, Lord Brahma awards him a benediction which was awarded to Hiranyakashipu and not him as per the Valmiki Ramayan.
Mata Sita never addressed Prabhu Shri Ram by His first name as does Janaki in this movie. She always referred to Him by using "Prabhu" or "Swami."
All the members of the Vanara race wore a loin cloth in their lower half as garment and not a dhoti as depicted in the movie.
Lord Hanuman did not use language of a ruffian as shown in the movie. He was well versed in Sanskrit, a learned scholar of the Vedas and the possessor of eight kinds of mystic opulence.
Lord Hanuman chants "Jai Shree Ram" every time He takes flight. Bajrang, in the movie, is not shown doing this.