At the "hen party," Thelma Lou walks past Jeff and Barney on her way to the kitchen to get coffee. Barney asks Jeff which girl he picked out to marry and Jeff points to Thelma Lou, who is somehow back in the living room with the coffee.
Towards the end of Barney's tirade in the courthouse, wide shots show Andy putting his left hand behind his neck, but close-ups show his left hand on the back of his chair.
Andy takes Jeff to get a suit, hoping Jeff will tire of pursuing Thelma Lou. There's no mention nor concern about who pays for the suit.