If this works:

print $people[0][0]->name;
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then looping would work like this:

foreach ( @{$people[0]} ) {
    print $_->name;
}
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Or you could do it like this:

foreach $row ( @people ) {
   foreach $cell ( @$row ) {
      print $cell->name;
   }
}
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The point is that each element in @people is itself an array reference, and needs to be treated as such. In the first example, in order to dereference an element of @people as an array, you need the curly braces between the "@" and the expression that represents the array ref.

In the second example, doing the dereferencing in two stages makes the syntax less messy. At each iteration of the outer loop, $row is set to the array ref for the inner dimension of @people, and is easier to dereference.