Yesterday, we showed you a deleted scene that will be on the upcoming Blu-ray/DVD for The Avengers.  Today, the gag reel and a behind-the-scenes clip have gone online.  Cobie Smulders absolutely steals the gag reel, and it makes me wonder when we'll get to see her in some comedic roles other than Robin Scherbatsky from How I Met Your Mother.  As for the behind-the-scenes clip, if you've ever wanted to hear famous people say nice things about Samuel L. Jackson, this is the clip for you.Hit the jump to check out the special features.  The Avengers hits Blu-ray, DVD, and Digitial Download on September 25th.Via Empire:Here's the official synopsis for The Avengers:

Marvel Studios presents in association with Paramount Pictures "Marvel's The Avengers"--the Super Hero team up of a lifetime, featuring iconic Marvel Super Heroes Iron Man, The Incredible Hulk, Thor, Captain America, Hawkeye and Black Widow. When an unexpected enemy emerges that threatens global safety and security, Nick Fury, Director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. Spanning the globe, a daring recruitment effort begins. Starring Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner and Samuel L. Jackson, and directed by Joss Whedon, "Marvel's The Avengers" is based on the ever-popular Marvel comic book series "The Avengers," first published in 1963 and a comics institution ever since. Prepare yourself for an exciting event movie, packed with action and spectacular special effects, when "Marvel's The Avengers" assemble in summer 2012. In "Marvel's The Avengers," superheroes team up to pull the world back from the brink of disaster when an unexpected enemy threatens global security.