Just prior to Sam hitting the orderly, he's seen in the wheelchair and walking across the floor wearing Miller's pants legs down. However, when the orderly looks in the mirror and sees Miller standing and walking, the pants should have still been seen and not cut off near the knees in the mirror.
If Billy is paralyzed from the neck down and can't move his arms or hands how can he control the electric wheelchair. Not a goof: It is possible for a quadriplegic to have minimal control of some fingers.
There are 'Energy Star' labels on the washer in the room off of the pool.
When Al would have seen Miller in the waiting room, he would have seen him as Sam, who would have had legs.
Sam leaps into Marine Corps Captain Ron Miller. His doctor, a Navy Commander, Ron Miller "Soldier". Soldier is used for members of the Army. Anyone else in the military would call him a Marine.