Other mistake: In the opening scene as Phil is walking from the blue screen to the desk, a clock is visible over the top of the camera and it reads either 12:20 or 1:20 (the hour hand is too motion blurred to tell which). The broadcast is supposed to be at 5pm. (00:01:40)
Other mistake: On the second day, Phil did his same tasks at about the same time as the previous day, so everything lining up the same made sense. However, on day 3, he quickly rushes out of his hotel, avoiding interacting with most of the people he did before and gets to the street with the beggar much sooner than he did before. Yet Ned still is there crossing the street and sees him exactly the same as before. However with Phil having skipped so much he would have gotten there and passed that spot a good while before Ned would have gotten there, and they should not have had the exchange again on day 3. Same thing for when he arrives at the Groundhog Festival, with Rita greeting him like he's late. But he would have gotten there much sooner this time.
Other mistake: Focusing on the clock as it turns to 6:00, one clock has a visible gear in the middle of the numbers. At other times, no gear.
Other mistake: When Phil is driving the car against the train he ultimately swerves out into a railroad crossing. However when the approaching train is shown from within the car in the last seconds before the two vehicles would collide, there is no crossing to be seen on the remaining track stage between them.
Answer: Old fashioned hotels have a single boiler for all the hotel rooms. Once the hot water reservoir is used up there won't be any more to use until the reservoir is refilled. This only happens once every few days.
lionhead