film techniques - Why animation was used in several scenes of Revolver?

Revolver. Though, An amazing movie regarding EGO, EGO and EGO...

At most times, the movie included actual animations of Andre, Liotta and several other characters. Like - when the money was stolen, Macha, Lord John, all were in cartoons. Why was such a theme introduced at that time?

Was that simply to cover the actual guns and blood used by the fellas? If not, why then?