A man fell into a airlock - parental advisory

No the advisory is not for the text but rather the last panel on the page, which actually appears lined for the first time..

But before we get there is it me, or is this whole sequence completely unrealistic, not to mention rather unlikely

to quote a movie (though I can not remember which one right now), "You don't just fall into a airlock, levers have he be pulled and buttons have to be pushed" yes, and all in the correct sequence - what's the chances of doing that while out of your head on illicit narcotics? (oops that should have had a spoiler warning before it..)

and don't even start me with the depiction of what happens to the guy once he has managed to cycle the airlock - either the movie, which cuts to a shot implying that the mans guts turned inside out completely or Sterenko's version which seems to suggest the guy had a massive carton of tomato ketchup with him..

But - don't just take my word for it..

"In scores of science fiction stories, hapless adventurers find themselves unwittingly introduced to the vacuum of space without proper protection. There is often an alarming cacophony of screams and gasps as the increasingly bloated humans writhe and spasm. Their exposed veins and eyeballs soon bulge in what is clearly a disagreeable manner. The ill-fated adventurers rapidly swell like over-inflated balloons, ultimately bursting in a gruesome spray of blood.

As is true with many subjects, this representation in popular culture does not reflect the reality of exposure to outer space"

says http://www.damninteresting.com/outer-space-exposure

and it goes on to explain what would happen.

No, sorry these sort of "splatterfests", are just a hollywoodisation, similar to how a car can just spontaneously explode for no apparent reason what so ever, its all designed to introduce a element of drama in a cutting way, taken as a piece of entrainment, well that's  question of opinion

But as a fact, no - it isn't!