1. An hourglass appeared at the beginning of the music. Look carefully, the hourglass actually flows backwards, and the background table also goes backwards when the words "Detective Conan" appear. It may mean that Conan's plot is counting down, but if you want to grasp the truth, you still need to get some clues from the previous plot.
2. The gene-like pattern that appeared when the new one became Conan explained why aptx-4869 made people smaller.
3. The appearance of Xiao Lan and Xiao Ai may show their feelings for Conan, and these two people will definitely play an important role in the ending.
4. Later, when Conan was running, Xiaolan and Xiao Ai appeared on both sides, indicating Conan's final choice, but he finally chose Xiaolan, but because Conan couldn't catch up, we don't know if he could do it after becoming a newcomer. (don't put it behind)
5. A series of characters appear later, which may be people who will have certain influence in the end.
6. Conan is handsome when throwing things. I don't know what this means.
7. A little sadness on the beach may indicate that she will be alone in the end.
8. Finally (finally, I was exhausted ...) Conan came to Xiaolan with a Kudou Shinichi smile on his face, indicating that Conan wanted to tell Xiaolan the truth, but Xiaolan helped Conan put on his glasses. Maybe she already knows his identity, but she can't bear to part with Conan.
The above is just my guess, not necessarily right.