You have a precedence problem in your dereferencing ($$_[2] and @$_[1]), i.e. you need additional braces.
And, as moritz said, you need to dereference in the assignment, too. IOW, this should work:
...
print "count is: ${$_[2]} , reference is: $_[2] \n";
print "data is: @{$_[1]} , reference is: $_[1] \n";
${$_[2]} = 0;
@{$_[1]} = ();
...
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