This episode is a hilarious farewell to Kelso, but with he and Eric gone, I don't know how the show is going to remain as entertaining as ever. With Kelso finally not screwing something up, but Fez doing it for him by telling Jackie is a hilarious plot, and the twists and turns of the proposal are great, and Kelso getting a security guard job in Chicago to be closer to his daughter is obviously the best way to write his character off the show.
Red and Kitty's anniversary is also fantastic as it ties all the plots together, and Red's romantic idea to rent a cheap motel before the party was great. As for the long distance relationship between Eric and Donna, problems in communication arising this quickly can't be good, but the start of this wasn't that interesting in this episode in comparison to Kelso leaving and Red and Kitty's 25th year of marriage.
Overall, the episode is a fantastic way to end Kelso's character on the show, by referring to his relationship with Jackie, that was always my favourite of the show, all the stupid things he's done over the years, the final circle with him, and of course one last burn.