} else { # No other page created it, so create it now...
my @otherBlocksOfCode;  # <===== lexically scoped to else block
push(@otherBlocksOfCode, {-type=>"text/javascript", -src=>"/path/file1
+.js"});
}
[download]

Your else block is the containing block for the my @otherBlocksOfCode;. When the else is completed, that variable no longer exists. In other words, if you remove the my @otherBlocksOfCode; line, it should work how you expect.