When George MacAllister is shot in the back, the bullet that wounded him would have to have gone through the nearly-closed door to hit him. But there is no bullet-hole in the door when MacAllister steps away from the door.
When John Carroll's character gets shot in the back in the beginning of the movie there is no bullet hole in his coat until he gets back to his hotel room and then the hole appears in his coat.
Constance Dowling's character is listed as Helen Anderson in the credits, but her name was Helene, as mentioned several times in the movie.