Deadpool and Wolverine's script is now available to be read online – and it's a goldmine of hidden details, including this reference to Henry Cavill's iconic Mission: Impossible scene. As seen on the Marvel movie's For Your Consideration page,

A user on Marvel Studios' subreddit posted the script, which Disney made freely available as part of the awards push for Deadpool and Wolverine. Instead of revealing the role of Jennifer Garner's Elektra, the script calls her Eleven, the character played by Millie Bobby Brown in Stranger Things.