In this movie, Nobita and his friends create their own universe as part of a school project, learning about the history of the Earth and humanity along the way. In some ways, this may be the most unusual Doraemon movie of all, given that it largely consists of a series of vignettes with the main characters mostly observing (and occasionally interfering with) what happens. Although I probably wouldn't want every Doraemon movie to follow this format, I like what they did here, and as a paleontologist, the "history of the world" theme appeals to me.
Although Nobita's friends aren't the focal characters here, it's funny to think about how they each became involved in Nobita's school project. Whereas Gian and Suneo had their own reasons to mooch off Nobita's work, Shizuka essentially ends up doing extra homework! (To be fair, if my friends had asked me to help with a school project for which I got to observe Earth history, I probably would have, too.) Other humorous details are included alongside the end credits, during which we get to see the school report that Nobita and his friends put together.
Although Nobita's friends aren't the focal characters here, it's funny to think about how they each became involved in Nobita's school project. Whereas Gian and Suneo had their own reasons to mooch off Nobita's work, Shizuka essentially ends up doing extra homework! (To be fair, if my friends had asked me to help with a school project for which I got to observe Earth history, I probably would have, too.) Other humorous details are included alongside the end credits, during which we get to see the school report that Nobita and his friends put together.