Keaton, who plays the role of Raymond Sellers, boss of the evil Omnicorp in the sci-fi movie, said Kinnaman's Robosuit was way better than his rubber costume in 1989 Batman movie.
"That sissy suit - they have air conditioning in it. When I played Batman I couldn't do any of that because I couldn't get up to go the bathroom," Keaton recalled.
"I enjoyed every minute of watching Joel. I'd just sit there in my little business suit and watch him. There was a lot of gloating," Keaton told Contactmusic.
As part of his role, Kinnaman had to wear the RoboSuit in most of his scenes but the actor got no sympathy from Keaton.
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Directed by Jose Padilha, the film is a remake of 1987 movie of the same name.
The film is releasing in India on February 14.