For those who paid attention to the timeline of Orange Is The New Black) - and witty dialogue. This winning combo made it a success with viewers, and as the show progressed it also began to focus on the grown-up characters, with Red and Kitty Forman becoming cult favorites.
It's Always Sunny In Philidelphia) in an early lead role, it was critically drubbed and swiftly cancelled.
The creators of Star Wars in 1977 became a big deal in the latter half of the season.
By season two of That '70 Show, it was already burning through chunks of time, with opening title cards establishing firm dates like "June 1977." Later seasons were defined by the year they supposedly took place in, with season 3 to 6 taking place in 1978. Since That '70s Show proved more popular than the network could have predicted, this required a fudging of the timeline to make it work. Of course, this created all sorts of weird logic issues, like the fact it had five Christmas episodes despite the series taking place over the span of four years.
There's also the fact most of the supposedly teenage characters were played by actors who aged into their mid-20s as That '70s Show progressed. In the end, fans tend to laugh at the timeline flaws since it was a necessary evil to keep the show going. The finale is set on the last day of the 1970s, and as the countdown to 1980 ends, the show abruptly cuts to black to signal the end of the decade.