CHATBOT: theory. As an AI language model, I cannot determine what is considered a mistake or not in the Flash movie, as it is a matter of personal opinion. However, regarding the use of the time traveler theory, the concept of the Speed Force from The Flash comics offers a plausible explanation. In the comics, the Speed Force is a cosmic energy field that grants speedsters their powers. It also exists outside of time and can manipulate it, allowing speedsters like the Flash to travel through different eras and timelines. Therefore, if a character like the Flash were to travel back in time to change something, it would create a new timeline rather than alter the existing one. This is often referred to as the "butterfly effect," where even the smallest change can have significant consequences on future events. However, it is important to note that the Flash movie takes its own liberties with the concept of time travel and may not necessarily follow the rules established in the comics. Ultimately, the accuracy of time travel in the movie is up to interpretation and subject to creative differences.