Many wheelchair users said Sully's legs looked skinny, and wondered if Cameron had digitally altered them to make them appear atrophied.
They also noticed a detail others might miss; that Sully didn't have a specialized cushion.
"Even for people in manual wheelchairs, they use some sort of cushion to prevent pressure sores," Klebine said
Santina Muha, who suffered a spinal cord injury at age 5 in a car accident, said Sully labored too much when he got in and out of his wheelchair.
"There was one scene when he was doing a transfer and he had to pull his legs over. I thought he struggled too much with the weight of his legs," Muha said. "I'm a little girl, and he was a big strong guy. It should take much less effort for him to transfer."
ABC News' Lauren Cox, Huma Khan and Alexander Marquardt contributed to this report.