Factual error: A character in the episode has invented denim, but denim was invented in 1873 and was being used widely up to the time period of the series, which is set in 1893.
Graduation - S5-E24
Factual error: In the episode Class Pre-Union, they were the class of 2000. In the episode Graduation, they were the class of 1998.
Shopaholic - S3-E6
Factual error: In the last scene, Fran has a soda cup from In-N-Out, which at the time, of the show, only had one restaurant out of the state of California, in the state of Nevada. Even today (2020), they don't have any stores east of Texas.
Factual error: At about 8 minutes in, Grace's ex-husband is talking about flash flooding and water mixing with electricity. He's makes a comment about going up like Gary Gilmore. Gilmore was executed by firing squad and not in the electric chair.
Suggested correction: The entire series was set in an alternate history of sorts, so most, if not all, historical "inaccuracies" cannot be regarded as mistakes.
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