Instead of saying “However, the callback was as close as he was going to get to Pandora,” you could rephrase it as “Unfortunately, the callback brought him closest to Pandora.”
In the second sentence, instead of “Gad claimed that when production digitized him to see how he’d look as a Na’vi, he looked too much like another blue creature who lived in a magical forest,” you could say “Gad asserted that once they digitally transformed him for the role of a Na’vi, he resembled another inhabitant of the mystical forest who was also blue.”
Lastly, instead of “He shared, “I apparently did not get [the role] because, while James Cameron was said to be thrilled with my audition, when I was turned into a digital Avatar I supposedly looked like a tall, overweight Smurf,”” you could rephrase it as “He mentioned that he likely didn’t land the part due to the fact that, even though James Cameron allegedly found his audition impressive, when they converted him into a digital Avatar, they claimed he looked like an oversized and portly Smurf.”
Lastly, instead of “Blue just wasn’t his color,” you could say “Simply put, blue was not the right hue for him.