Trivia: Ryan Reynolds wanted Chris Evans to have a brief cameo in the film. Evans was incredibly busy working on another project, and told the crew that while he definitely wanted to do the cameo... he literally had to be in-and-out of set in about ten minutes time because his schedule was so tightly packed. The crew did everything to prepare for Evans arrival, and once Evans got out of wardrobe/makeup and onto set, they were able to get his scene filmed and get him out in only seven minutes.
Trivia: In one scene, a power-up is just barely visible in the background. It's a bottle marked "Subtle Product Placement." If you look very closely, you can actually see that it's a bottle of Aviation American Gin. Star Ryan Reynolds partially owns a stake in that brand of gin, and has made numerous humorous videos online promoting it.