At the end of the movie, the siblings found two cameras, one was discovered by the younger sister and only recorded the birthday party. The other one was obviously left by the male protagonist when he traveled back to the past. But the problem is that when the male protagonist traveled back to the past and destroyed the time machine, his camera warned that the tape was out, and after that, the camera should have been dusted together with Dad's camera. In other words, it is impossible for his camera to have a dialogue between the brothers and sisters about "father has two cameras", because the recording of the camera stays at the age of 7, and this dialogue was newly bought by the brothers and sisters who grew up. Recorded by the camera.
Then there is only one possibility that what the movie shows is only the first great crossing, and in fact, the male protagonist has experienced at least two great crossings before the discovered camera will record their ongoing conversation.
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