There was connection between Jennifer Aniston's Rachel Green and ER

Both Noah Wyle and George Clooney starred in one of the episode of Friends, as doctors. That time, Wyle and Clooney also acted as doctors on ER.

Wyle was not aware that there was connection between Friends and ER.

Aniston's character Rachel Green was also same name as ER's Mark Greene's daughter Rachel.

Additional to that, Wyle was friends with Aniston and Matthew Perry.

He explained, "Jennifer was roommates with my ex-girlfriend, and their other best friend was Matt's girlfriend. So we all used to pal around".

"So it felt quite natural and quite organic to have all these people that I knew and liked, to see them be on these shows that were very popular. We were all working hard and selling them hard, and it was a great time".

He also spend time on the Friends set with Clooney, "[George and I] would go over there and watch them tape. We would wrap, and then we'd go over there and watch them tape their show just because we were all buddies. And I think the fact that we were there hanging out put a bug in — put the idea in somebody's mind."