Continuity mistake: When JD is trying to free his hand from the glass bottle beating it on the pole, his sleeve shirt is first lowered and then raised in two different shots.
Continuity mistake: When JD is in the wheelchair talking to Dr Cox and he almost tells him he was a gymnast in high school, a female doctor in a white coat is walking in his direction behind him. One shot later she's gone, and a few shots after that she's back walking in the same direction. (00:02:55)
Answer: No, it was a fake, they used a stamp.
It is real.