Avengers: Age Of Ultron - 15 Obscure Easter Eggs You Probably Missed

Probably the most fleeting blink-and-you'll-miss-it reference in the entire film, there's a familiar looking cameo in Thor's dream sequence beyond the appearance of Idris Elba's appearance.

As Thor's nightmarish vision unfolds, there are shots of masked Asgardians seemingly tormenting him from the shadows, and one of them will look remarkably familiar to Thor fans.

The Korbinite alien with the distinctive design seems to have lent his face to one of the creepy golden masks in the under-cooked Thor sequence, though it's on screen for so little time that only multiple viewings will likely pick it up.

Beta Ray Bill has been suggested as a possible introduction for Thor: Ragnarok so the fleeting homage to him would make sense in that respect.