Corrected entry: The children (Auggie and Jack Will) in the movie are seen using Acer Chromebooks in order to play Minecraft, especially in one endearing scene where their friendship is mended using the game. Chromebook computers use Google's own Chrome OS as their operating system, which renders them unable to run various programs which might be available on your average Mac or Windows PC, such as Minecraft.
Correction: If you install linux onto a non arm processor device you can install minecraft on a Chromebook.
Correction: 2017 Chromebooks support Google Play and therefore Minecraft. I can play Minecraft on my HP Chromebook 13.