Instead of saying GPS Donna Carter say's GSP.
If Buddy got run over by a car he would not be able to run, or walk after just 5 days, especially after surgery.
While Donna, and Jake are talking outside Elizabeth's room, Elizabeth's door opens so that she can hear what they saying better but there is no way that she could have opened the door since she is seen sitting further away from her door.
When Rudy drives his truck away towards the end of the movie, you can see that his passenger side view mirror is not opened.
While on the way to California, his car has a California license plate. He doesn't live in California, so.... Also the route he is taking to California, If you were in Texas and headed toward California going to Las Vegas would be out of the way.