With the observation the young Nemo makes 'As long as you don't choose, everything remains possible', would seem to be a variation on basic quantum theory as illustrated through (Erwin) 'Schodinger's Cat', unseen, in a box thought experiment i.e. that the choice to make a decision, to observe what is, coalesces / collapses states of uncertainty (the cat is only either dead or alive, only when looked at), into what we experience as our = his, Nemo's, final reality. See more

Goofs

When Anna's moved with her father to Brooklyn, NY, and Nemo's mother has intercepted a letter she sent to him, the return address - which usually has some amount of 'genuine-ness' to it, in this case is far from reality. It would seem the return address was written by someone who didn't even attempt to simulate a real address for Anna, as it appears it's: ' Anna Vigo 139929 9th Ave. East, Brookland, NY, New York, USA, 43052'. ZIP codes in NYC all start with a '1', with the second number being a '0' , '1', or '2' (and, yes, 'Brooklyn' is misspelt as 'Brookland'). See more