Raikkonen beat his team-mate to second with a late-race pass at Turn 1.
Radio broadcasts picked up tense conversations between Grosjean and the team over whether he could repass afterwards, culminating in a request for the Frenchman to "smile" on the podium as the matter would be discussed later.
After the race Grosjean played the matter down and said the loss of second place was just down to his own mistake.
"Unfortunately for me and good for Kimi, the safety car came," said Grosjean. "I made a small mistake, my fault, and Kimi passed me and then there were yellow flags so I couldn't use DRS.
"I don't hear most of the [radio] conversation. I was quicker today. It is a track where it is almost impossible to overtake.
"I should have avoided the AstroTurf in Turn 15 and that would be the end of the conversation.
"It was my mistake, it is not the end of the world."
Raikkonen said the pass had been fairly routine.
"He made a mistake in the second-last corner and I got a good run," said the Finn. "I think he moved a few times to the left.
"I heard there would be yellow flags on the straight so knew he would not get me back with DRS.
"So I decided to overtake and it was not too difficult."