Rebecca supposedly uses Woody's credit card for her airplane ticket, the phone call from the airplane, and claims she'll use it to buy a new wardrobe. Yet, just a few episodes earlier, in Norm and Cliff's Excellent Adventure (1990), Woody maxed out his credit cards on the home shopping channel.
A crowd of fans can be seen outside of Cheers in the middle of the street when they film an exterior shot of Melville's.
When Sam goes to take the door knob off with "one of those putty things," the door moves noticeably, even though it's supposedly locked.
Sam told Rebecca that she had worked at Cheers for five years. Assuming that the broadcast dates for episodes correspond with real-world dates, Rebecca had worked at Cheers a maximum of three years, nine months.