Trial and Error (1997) on Netflix

Charlie's a lawyer who's about to get married. His best friend, Richard, an actor shows up and Charlie needs to go to a small town to handle a case. But because Richard got him so drunk, he couldn't appear in court so Richard takes his place. He tries to get a continuance but the judge orders either he accepts the plea that was agreed to or go to trial and he decides to go to trial. And when the judge won't let Charlie in the court room, he needs to find a way to coach him. The prosecutor intrigues Richard and she thinks he's a creep because his client is guilty of defrauding so many people. Charlie's taken with a waitress even though he's engaged.