Before Alice discovers the kids on TV while changing the channel, she'd been watching a soap opera, yet it was a Saturday morning. A soap wouldn't have been on.
The title of the episode is a misnomer, as the contest took place in the morning.
Jan lays 85 cents on the counter to pay for the engraving on the platter. When it is realized that she doesn't have enough money, the clerk puts away the platter while Jan turns to walk out of the store. The 85 cents somehow disappears.
As the kids are secretly practicing & rehearsing in the garage for a singing competition. As Alice (the first discoverer) listens from outside, you can hear Maureen McCormick aka "Marcia" calling Chris Knight by his real name, instead of his character name, "Peter".