If you and the guy are together: 'me too please' or 'I'd like an apple pie as well'. If he is just the person who happened to be in front of you in the queue you could say 'I'll have an apple pie too please' but normally you wouldn't really comment on the previous person's order, you'd just order an apple pie.
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Khoffyou could try saying "I'll have the same thing he ordered."right ... and you can point to their table ...