|20th Century Fox|
You know that giant ship near the end - the one Deadpool and Ajax fought on?
That was supposed to be a SHIELD Helicarrier, like the one seen in Marvel's The Avengers.
The ship didn't look exactly like the Helicarriers in the Marvel Cinematic Universe because Fox had to change the design for legal reasons.
io9 has the full story below.
Here's Concept Art of That Ginormous Marvel Easter Egg in Deadpool