Chronological order of Season 4 episodes?

Does anyone know if there is a chronological order to the season 4 episodes? I only saw a few s4 episodes back when the show was airing, and now that I have the DVDs, I was wondering what would be the best order to watch them in. In the first three seasons, "Hot Seats" comes first and "The Seminole Mystery" comes last, but all the episodes in between can be watched in any order since there are no real developments or references to things that happened in previous episodes. I was wondering if season 4 was basically the same way. I know that "The Paul Revere Mystery" and "The Spare Parts Mystery" are the first two episodes, and I believe the "Itchy Shorts Mystery" comes before "The Robot Mystery" and "The Egg Mystery" (since I believe "The Itchy Shorts Mystery" is the episode where Christie is introduced, and she also shows up in the latter two episodes). Is there any chronological order other than that? Is there an episode that functions as the finale?