Other questions to ponder:
In Vito's office when Mike returns with Clemenza after the hospital thing, the clock on the mantle behind Sonny says 7:00. I'm assuming that AM since PM that time of the year would be in darkness. Is it AM the next day? That's seems a quick turn around for Mike since they had to dig some bone out of his jaw.
Also, the hit on Bruno at 4 AM must have been quickly arranged since it appears to have happened only about 6-8 hours after the hospital thing.