Actor Ron Bisaga (Bob Hope) suffered a severe concussion riding his bicycle just prior to filming his final scenes in the end of the movie.
Nearly all of the dialogue in the film is entirely improvised, based on a detailed story outline and shot list.
The scene in which Robbie Thurston is hunting for terrorists in the woods was actually Deane Weislogel's screen test prior to casting.
The man who wants to take a picture of the Minnich's historic guest house is actually the real-life owner of the farm property.