Originally Posted by NikeeGoddess
(he grabbed the wrong arm btw)
Noticed that too. He did it twice, once earlier in the film, a minor one, to set up the later one. Supposedly a heart attack, although usually felt in the left arm, can also be signalled by tightness in the right arm or even ones back. But its not as common (or commonly known) so not sure why a writer would have a character grab his right, creating problems for him/herself.