use strict;
use warnings;

my @arrexample  = qw(The quick brown fox does stuff);;
my %hashexample = qw(k1 v1 k2 v2 k3 v3);

my @arr = (\@arrexample, \%hashexample);
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how can I dereference @arr

@arr is not a reference, so you cannot dereference it. Its elements are references.

assign @arrexample to @arrexample_copy out of @arr:
my @arrexample_copy = @{$arr[0]};
assign %hashexample to %hashexample_copy out of @arr:
my %hashexample_copy = %{$arr[1]};