I will explain parts of this to the best of my ability. Paul Reubens who played Peewee Herman also played a evil spirit whose now inside a Dr. Stein muppet. Thomas F. Wilson who played some members of the Tannen family from Back to the Future plays Hank. The Monitor from Elseworlds crossover cameos. They also reference the main three heroes of that. The legends has a book capable of turning your imaginations into real things. Obviously similar to Imaginationland arc from South Park. A theme park that's magical while referencing stuff like Disneyland and Universal Studios. I am aware not a lot of people want Legends of Tomorrow. I hope this long comment helps make more sense of this.