As Tree tries to figure out what's happening to her, she begins to experience a range of emotions, from frustration and anger to fear and vulnerability. She also starts to notice that she's not the only one who seems to be aware of the time loop. Her professor, Dr. Gregory Butler (Charles Aitken), and her friend, Ryan (Rob Mello), seem to know more than they're letting on.

For those who want to dive deeper into the world of "Happy Death Day", here is an index of key topics and themes: