Trivia: Spoilers! The end credits feature Deadpool using Cable's time travel device to "fix the timelines." He goes back and saves Vanessa, then travels to X-Men Origins: Wolverine and kills the awful version of Wade Wilson from that movie (also played by Ryan Reynolds). He finally goes and shoots Ryan Reynolds in the head before he appears in the Green Lantern movie. Also in the Blu ray version, he finds a newly born Adolf Hitler and after some working up, decides to kill him (offscreen).
Trivia: A promotional poster for the PG-13 version of this film (Once Upon a Deadpool) was released as a parody of a painting commissioned by the LDS church called "The Second Coming." This was reportedly done in response to the state of Utah - known for the LDS church having unconstitutional influence over its state laws - fining a theater that served alcohol for showing the first film, alleging that it violated state liquor laws by serving alcohol while showing nudity or simulated sex.
Trivia: As with the first film, Reynolds' face being covered meant if he thought of funnier lines after filming was wrapped it was comparatively easy to record new ones and replace the originals.
Trivia: Deadpool lands on a Hillside amusement park sign when parachuting. Ryan Reynolds got his start on the Canadian TV show "Hillside."
Trivia: Domino, as played by actress Zazie Beetz, did not shave her armpits, visible during the fight on the prisoner transport convoy. Beetz felt that the character should reflect a changing female aesthetic.
Trivia: Yukio, who had previously appeared in the 2013 film The Wolverine, plays a short role as Negasonic Teenage Warhead's girlfriend and helps to defeat the Juggernaut.
Trivia: When Deadpool is growing his legs back, the shirt he is wearing is the same as Chunk's from The Goonies.
Answer: That's one of his superpowers, "Comic Awareness" (sometimes called 4th Wall or Medium Awareness). This is something that Deadpool has in the comics and was incorporated into the films. Other than being a framing tool and to be funny, I don't know if the creator, Fabian Nicieza, or any writers have said why they gave Deadpool that power.
Bishop73
Deadpool's trait of breaking the 4th wall appears to have been the idea of writer Joe Kelly, as Deadpool didn't break the 4th wall for the first time until Deadpool #28 in May 1999, more than 8 years after his debut.
Phaneron ★