The timeline didn't always make sense on That '70s Show, so I'm not gonna harp on this too much, but I am gonna mention it...

Leia turns 15 in one of the episodes. The show takes place in July 1995. The series finale of '70s was on December 31st, 1979. In order to be turning 15 in 1995, she'd have to have been born in July of 1980. If you recall, the final season of the series, Eric was in Africa and Donna dated Randy. Forman returned in the last episode and reunited with Donna. But if they conceived Leia on (let's say) January 1st, 1980, July would not be 9 months later.

No, I'm not insinuating that Randy is the father, lol, I'm just pointing out another inaccuracy in the world of That '70s Show.

Also, I haven't seen the show yet since it hasn't been released. But the description of one of the episodes is that it's Leia's 15th birthday and I already know the show takes place during the summer of '95.

That '90s Show is retconning the Jackie/Fez relationship which was one of the plots of the series finale. I wonder if they're retconning Eric's absence during the final season as well. Not all is retconned as it seems Bob still lives in Florida, which he announced he was moving there in one of the last episodes of the series.