comparison and contradiction to The Sound Of Thunder

•   The Sound Of Thunder by Ray Bradbury differs from the movie, not by much, but in the details we figure out the differences. In the book Bradbury mentions that when they travel they wear oxygen masks, while in the movie they go without. The oxygen masks are important in the story because they filter bacteria so there is virtually no trace of them ever being there. The level of detail in the book where they take all measurable precautions isn't as thorough in the movie, where the only precaution they take is to stay on the path.
• The theme Bradbury is trying to portray is a warning against time travel. 
• The story is a better representation of the theme Bradbury is portraying because of all the precautions.The precautions make it seem like a more tedious procedure than it should be. Eventually if the procedure of safety is long enough people will take a hint that they shouldn't be going through time.