It appears that there is a problem. Basically more than one.

Fist problem is in the establishing shot when our heroes run to the millennium falcon. If you notice the matte of the falcon the top of it is a bit messed up. in the following shot the matte is a bit different but we see a large live action matte box where the heroes supposed to be.

Also if the exit is behind us it should have been light or at least some reflections or or...

Also if the paths of the heroes and Imps are that...:

...Then the exit door should have been there(ignore the scale):

So why the imps didnt try to block the exit?

I original though that the imperials should shoot the falcon from behind but now the must be near the exit trying to block the escape.

It appears that Vader comes from an opposite path(behind the MF) so he sees it flying away.

Also like in the space slug scene we see the MF take a turn to head towards to the exit/mouth. In hoth escape not necessary but a good hint is too show that it turns(from cockpit or it boosts to the wrong direction.

Not to mention again some mattelines that not blend with the live action sets.

Also an other shot is how sky and snow are blended together.

See how the colors pop up:

Also the path of the coming X-wing is a bit fake. i think Ady can make its path flawless

One more: when Luke arrives and talk with R2 about dagobah system, R2 has some mask errors while turning his head. Notice the front camera projector or whatever it called. At some frames there is a bad cutout

-Angel