Other mistake: In the scene after De Niro's car explodes, they show him being put in the ambulance feet first. Patients are always put in head first.
Other mistake: Just after Grandma Willow says "There's still some snap in these old vines," John Smith puts on his bag, but he just presses it to him instead of putting it over his head.
Other mistake: When Apollo 13 lifts off, you hear a voice saying something like 'Houston we have cleared the tower at 13:13'. However, when this is said the Saturn V rocket has nowhere near cleared the tower.