【Watch Power】

When it comes to Game of Thrones,Watch Power no detail -- however small, or possibly irrelevant -- can afford to be overlooked.

SEE ALSO: The tiny detail you probably missed in this 'Game of Thrones' photo

On Tuesday, the show's ever-sneaky makers released a behind-the-scenes video about costume design on the official YouTube channel.

And guess what? They only went and slipped some crafty new footage into it.

Look, here's Tyrion wandering along a beach:

Via Giphy

And here's Samwell pointing to a book:

Via Giphy

There are a few other bits and bobs like that, but we really want to draw your attention to three moments in particular...

1. Jon Snow by the sea.

Original image has been replaced. Credit: Mashable

The shot above, which shows Jon Snow standing by the coast and looking decidedly un-snowy, immediately stands out.

He's clearly a long way from the Wall, isn't he? If anything the landscape above looks like the place Daenerys and her crew can be spotted in the Season 7 trailer. It's not exactly proof that everyone's favourite bastard will meet up with Daenerys this Season, but it feels like some pretty hard evidence.

2. The Hound playing with some snow.

Via Giphy

The Hound doesn't appear in the Season 7 trailer, so this is our first real clue as to what he'll be up to next Season.

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The last time we saw him he was heading north with Beric Dondarrion's crew. From the looks of the snowy clip above, his plans haven't changed.

3. Arya's sword turning up in an unlikely place.

Original image has been replaced. Credit: Mashable

We've saved the most interesting clue until last.

In the photo above you can see another shot of Arya, riding on a horse with Needle safely tucked in her belt.

Nothing that interesting there, right?

As Reddit user u/N355UN0 spotted yesterday, though, it doesn't appear to be the only shot Arya's sword appears in.

Here's a screenshot from a moment that appears in the video shortly after the above clip of Arya:

Original image has been replaced. Credit: Mashable

Here's a close-up:

Original image has been replaced. Credit: Mashable

That flash of Sansa in the crypts of Winterfell is nightmarishly brief, but the person standing behind her -- who looks like a member of the film crew -- appears to be carrying a sword. A very familiar-looking sword.

We can't be 100% certain that it's Needle -- it could be a blade with a similar hilt, after all -- but if it isthen the implications are huge: it would mean that a Winterfell-based reunion between Sansa and Arya is pretty much guaranteed to happen in Season 7.

You can watch the full video here and decide for yourself if we're jumping at shadows:

H/T BuzzFeed.

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