The helicopter used throughout the movie (quite a lot in the early scenes) is obviously a RC toy, since it doesn't have any doors or windows on the sides, but only a narrow, paint-on window in the front.
Throughout The Film, The Yeti Changes Height Drastically. Presumably At The Beginning of the film He Seems About 20-25 Feet Tall But In The Toronto Scenes He Can Seen To Be 50 feet tall. And The Yeti Would Shrink/Grown Throughout the entire film.