[xionon]

Not only that, but they did it a second time with Captain America: Winter Soldier.

[oddevan]

Which was the bigger tie-in, as the episode the week before ended with the already-released scene of Nick Fury's car chase, and the episode the week after dealt with the (very significant) aftermath.

For many reasons, it was one of the best moments in the series.

[ChuckMcM]

Your right, not once but twice in a single TV season. That is seriously amazing planning.

[danielweber]

I think lots of people would balk at those constraints, but Joss Whedon sees them and thinks "this is awesome!"