Georgia Code Title 17. Criminal Procedure § 17-8-57

(b) Except as provided in subsection (c) of this Code section, failure to make a timely objection to an alleged violation of paragraph (1) of subsection (a) of this Code section shall preclude appellate review, unless such violation constitutes plain error which affects substantive rights of the parties. Plain error may be considered on appeal even when a timely objection informing the court of the specific objection was not made, so long as such error affects substantive rights of the parties.

(c) Should any judge express an opinion as to the guilt of the accused, the Supreme Court or Court of Appeals or the trial court in a motion for a new trial shall grant a new trial.