Also from Labyrinth, the Nouns in the first riddle all put their own sounds into their laughs. E goes "Hehehe," A goes "Hahaha," and I goes "Hihihi."
E.T: the Extra-Terrestial: Possibly a coincidence, but in the first episode of E.T., Joz brings back her "69" joke. At first, this just seems like a Call-Back to Jumanji, but it could also be Foreshadowing to the Bonus Scene at the end, which is based on a Doctor Whoepisode set in 1969.
Doctor Who: Day Of The Moon is actually a very good choice as a contrast to E.T. Both feature aliens with Psychic Powers accessed through their fingers, but whereas the latter has a group of children hiding an alien from their mother and the goverment, the former has a married couple working with the goverment to save a young girl (eventually revealed to be their daughter) who has been kidnapped by the aliens.
Bill and Ted's Excellent Adventure: Having Napoléon Bonaparte say that he can't stand Benito Mussolini is already quite a Take That! towards the latter, but it gets even better when you consider that Mussolini had a great admiration for Napoleon in Real Life. He's basically being dissed by his idol.
In the beginning of the story, Bill and Ted manage to get to class in time by doing a Time Skip to when they're already there. In other words, they solved their problems by basically travelling in time.
Halloween II: The Dullahan only shows up properly once (he returns for the climax, sans horse) but it's a thrilling scene that completely changes the direction of the story and eventually leads to either the death or disappearance of the protagonist. Now, which other famous Headless Horseman does thatremind you of?
Time Bandits: "Destiny is bullshit!" Of course it is. The whole premise of the show is that the "authors" have no control over the story.
Memento: Fridge BrillianceandFridge Horror. Aaron is introduced watching Looney Tunes in a dark home movie theatre. Harmless enough, right? This was almost certainly arranged by his caretakers. The darkness would help to hide the fact that he's not a little boy anymore, and Looney Tunes is old enough that he wouldn't notice any anachronisms giving away how much time has passed.
Fridge Horror
Labyrinth: Like in the film, Sarah saves Toby, defeats Jareth and returns to her own world. Unlike the film, however, it isn't quite made clear if her friends survived.
The Wizard of Oz: At the end, Dorothy sacrifices her dream and wakes up, hoping that a Dream Apocalypse will be less painful than a fiery one. However, if Oz was actually a real Dream Land — as the other players insist — then Dorothy's sacrifice may not have had any positive effect for anyone but her and her closest friends and family.
O Brother, Where Art Thou?: As pointed out by the players themselves, their campaign diverges so much from the original story that the heroes never end up soiling Homer Stokes' reputation, meaning that the people of Mississippi might end up with a Grand Wizard of the Ku Klux Klan as their governor...
E.T. The Extra-Terrestrial: Paulo's Adaptation Expansion has E.T.'s people being at war with another alien race. These aliens proceed to attack Earth, and are only defeated by the combined forces of E.T.'s crew and the American goverment. How did this work out in the original movie's continuity, where this alliance never happened?
Paulo Quiros: Jon's assumption that the aliens wanted to kill him and glass the Earth was wrong. They wanted a royal family member to add legitimacy. E.T.'s shoot first ask questions later strategy was real cause of the moon's demise.
Halloween II: Our protagonists assume that the undead versions of Frank Simms and Lynda Van Der Klok are just evil spirits trying to trick them, but the story doesn't really give us any proof that it's not actually them, having been subjected to The Corruption.
that E.T. overestimated the bloodlust of the We'ago, which creates a whole other kind of Fridge Horror.