1: 1. Frankenstein's monster has a hidden scar on his forehead, resembling Harry Potter's lightning bolt.

2: 2. The name "Frankenstein" is a nod to the scientist Victor Frankenstein, not the monster himself.

3: 3. Keep an eye out for a cameo appearance by author Mary Shelley in the background of a scene.

4: 4. The film pays homage to classic horror movies by including references to Dracula and The Mummy.

5: 5. A hidden Easter egg is the inclusion of a subtle cameo by director James Whale in a mirror reflection.

6: 6. The iconic lab equipment in the movie actually belonged to a real-life scientist, lending authenticity to the set design.

7: 7. Look for hidden symbols throughout the film, such as the recurring motif of lightning bolts.

8: 8. Notice the intricate details on the monster's costume, including scars and sutures that tell a story of his creation.

9: 9. The film's score contains hidden musical cues that pay tribute to classic horror soundtracks, adding another layer of depth to the experience.