ikegami:
"The process() method then returns 1 to indicate success", which you proceed to print. Don't print it if you don't want to see it.
Just to be perfectly clear, the statement printing return value of process() method:
print $tt->process('page.tt', $vars) || die $tt->error();
A statement not printing return value of process() method:
$tt->process('page.tt', $vars) || die $tt->error();
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What are you struggling to understand? As indicated by NetWallah above the default behaviour of TT is to "print" its output so calling code doesn't need to (in fact as you have observed, shouldn't) print any "output".
What you are printing is the success result returned by process - don't do that.
True laziness is hard work
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