It's implied that Martin's beer is room temperature because of the blackout. But when Martin complains about the beer's temperature, the power's been out less than ten minutes.
During the game of I'm the Dullest Person, Roz puts four pennies in a dish in the center of the table rather than giving them to Daphne, as she should per the rules. And when it's Martin's turn, Roz and Daphne each put a penny in the dish rather than giving them to him. Response: The center dish is being used to hold the pennies for the round. Daphne dumps the pennies from the center dish into her stack. It is unclear if Martin dumps his pennies into his stack.
While the power is out all over Seattle, Daphne (Jane Leeves) comments that the steaks they were going to have for dinner are no longer viable. That wouldn't be correct as Frasier's (Kelsey Grammer) stove is gas, not electric.