This is the best post explaining all the unanswered questions and miss interpreted moments!!!
https://www.reddit.com/user/Beginning_Fly_4063/comments/1f1e1y5/reptile_all_the_questions_mysteries_and_confusion/
If you don’t want to use the link search Reddit yourself for user u/Beginning_Fly_4063
The movie is an amazing yet miss understood and over criticised work of true talent!!! Don’t sleep on this gem!!! as there a few examples of films that tell a story and provide information to the viewer the way this one does!! Truly astounded by the way the movie purposefully avoids the uses of logically higher reason in a attempt to engage other senses and the subconscious to get you to feel and visualise things which provide and connect more context, background and ultimately answer than the words said on screen!!