Corrected entry: In the scene where Albert Finney smothers Phillip Seymour Hoffman in the hospital, near the end of the movie, he lifts Hoffman's head off the top pillow, uses it to smother him, then removes it and he starts to reposition the oxygen lines to his nostrils. When they flash to Finney and then back to Hoffman, the second pillow is back under his head without any apparent effort to - or enough time for - Finney to do so.
Corrected entry: Hank is easily convinced by his accomplice to wait in the car while the accomplice does the robbery, but the plan for the robbery includes getting into the safe, which only Hank knew how to do.
Correction: This actually fits in with Hank's character. He doesn't have much common sense. He's a follower, not a leader, he was very passive. With the extreme flow of emotions at the time it's likely he never even thought that far ahead.
Correction: Finney never replaces the second pillow. It falls off to Hoffman's right and is slightly visible in frame. The pillow the submitter is referring to is the one that was under Hoffman's head the whole time.