When Carol turns to lead everyone out of Jerry's office, there's a very large hole visible in Carol's stockings, behind her left knee.
When Bob gets a can of soda from the fridge, he asks Howard if he'd like a club soda. The can clearly reads 'creme soda.'
When Bob offers Howard a club soda, he refuses because he's worried about bad weather over Cincinnati. Then a few minutes later he says he going to Hong Kong which would be in the opposite direction.