> Why is it even allowed to work?

It's the same and documented so, after the first arrow the others are redundant

$VAR1->{"movie_results"}->[0]

exactly the same as

$VAR1->{"movie_results"}[0]

will update with links to perldocs ...

UPDATE

see perlreftut#Arrow-Rule

"In between two subscripts, the arrow is optional."

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^3: Having trouble reading in a hash from a referenced array by LanX
in thread Having trouble reading in a hash from a referenced array by SergioQ

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