To prepare for the film Ryan Reynolds (Wade Wilson/Deadpool) hired a swords master to train him.
Deadpool:
Kinda lonesome back here.
Deadpool:
Yeah, little help.
(at around 44 mins) When Deadpool is about to undergo the stress-inducing experiments, he is ungagged and the gag put on his chest. It disappears, then reappears as the scene progresses.
The scene after the credits shows Deadpool in a bathrobe, making fun of you, the viewer, for sticking around for so long. It is an homage to the post-credit scene in Ferris Bueller's Day Off (1986). He also talks about the sequel, and says it will feature Cable. Then he makes a few jokes about the casting, and pokes at other movies that usually tease future movies in these scenes. The final "chika-chikaa" he does refers to the song "Oh, Yeah", by Yello, which is featured in that movie.
The theatrical and DVD releases were censored by the CBFC in India to secure an A rating (restricted to adults i.e. 18+):
English
$58,000,000 (estimated)
$132,434,639 14 February 2016
$363,070,709
$782,836,791