Mike Hoffman said:
Also, Avengers did something similar, right? The movie had even opened internationally but they still waited to the last second to film and add the shawarma scene. Even my friend who worked at the theater and saw the film early said he checked and there was no stinger at the end. It was filmed so late, Chris Evans had a goatee for another role and had to cover his mouth during the scene.
Avengers already had a mid-credits stinger though, which was the only planned one. The shawarma scene was not planned, and only happened because the guys were still in costume when they went to eat after the last day of filming and someone had a hand camera. It was more or less 100% impromptu and added in post production, which is why the film quality is noticeably different, there are no visual effects, and no real dialogue. They just filmed hungry actors eating dinner and made money off it >.<