Where are the loopholes?

I didn't intend to write these, but I found that after watching "The Clues of Time and Space", I was a little confused. The plot in it, the coherence of the plot of time and space travel, I have to say that the plot setting is very exciting, starring me I also like it very much, but whether the plot has no loopholes will have to wait until I figure it out before making a conclusion. I have seen various movies about time travel before, and I also understand some conclusions. Suppose space 0 is the most primitive space, that is, Larry was not killed by Carroll, charlie was not killed, and then the cruise ship exploded.
After that, Doug participated in solving the case, saw what happened in the past, and sent the note, what happened at this time was transferred from space 0 to space A, in space A, Larry was killed by Carroll, charlie was cut off his finger, and then we see Continue to the beginning of the movie. But in this case, Doug shouldn't have found the things left by cleaning the wounds in Charlie's house. If it is to continue, Doug should have crossed once, then what happened in space A should be Yes: Larry gets killed by Carroll, charlie gets his finger cut off, Doug goes back in time but can't change the future. Then he still died after crossing from the future, and then he continues to investigate the case now.
What happened in space B was supposed to be Doug going back in time, Larry was still killed, but saving Charlie and the people on the cruise ship was the last scene of the movie.
In fact, the space 0, A, and B should be three parallels without interfering with each other. However, the main discussion in the movie is whether it can go back to the past to change the future, and whether the future can change such a thing, but it is obvious that the movie The three spaces inside are interconnected, and it does not involve whether these three spaces can be connected to each other and the continuity of things in one space. This is indeed a very good idea, but I always feel that there is something missing.
That is to say, in order for things in space B to happen, A is essential. Going from 0 to A to B is a process. Although it is parallel, it gradually changes after two crossings by Doug. In the end, when Doug crossed the line, I might have already made a choice, indicating that he did go back to the past twice.

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