The nose and ears also allow air to escape. I doubt it would do your inner ears much good to have the air in your lungs violently push its way out through them
You can have a pressure-fed O2 mask calibrated to not damage your lungs in a vacuum. In fact high-altitude military pilots long used such a pressure breathing system.
The problem is above 60,000 ft (the “Armstrong Limit”), it doesn’t do any good: Armstrong limit - Wikipedia
The actual problem is not that the blood boils but the body must be pressurized either mechanically or atmospherically, else you can’t put enough pure O2 into the lungs (without damaging them) to sustain alveolar gas transfer.
I should point interested parties to this discussion over at Cosmoquest, where the issue of 'blood boiling was examined;
tl;dr, there would be some formation of vapour inside a human not wearing a pressure suit, but it probably wouldn’t kill them. It wouldn’t have time.
Better hope the subject can hold their sphincters really, really tight!
Especially if you are behind them in space.
The scene in 2001 was based on a short story by Arthur C. Clarke where a segment of space station under construction broke off, so they had to figure out how to rescue the occupants with no airlock or spacesuits. I guess Art and Stan decided it would be a neat addition to the movie. Clarke no doubt based it on some data he’d read about.
Heinlein had a similar story where someone has to plug a leak; they don’t use their finger. The title is “Gentlemen, Be Seated”. The skin will suffer local damage, but the rest of the person is in full atmosphere and fine.
I suspect diving bends is far more dangerous because in deep dives - say 100 feet or more - you add 1 atm for each 33 feet or so, a 100 foot dive will dissolve 3 times the tolerable amount of nitrogen. Starting at 1 atm, the potential volume of bubbles with be much smaller; and even then, bends can take minutes to develop. You’ll be dead for other reasons first.
yeah, George Lucas conveniently gloosed over vacuum vs. atmosphere. R2D2 makes noises while parked outside the cockpit of the fighter. There is no real explanation (except “shields”) for the open landing bay on the death star. The worst was the giant worm creature on the asteroid in Empire Strikes Back, crew wandering around outside (hey, what’s with the gravity, too?) with just facemasks. But then, after Star Wars, where it almost looked like Lucas understood the need for a warp drive and the VAST distance between star systems, along comes TESB where they limp between star systems in days without a warp drive.
But basically, if you managed to keep the head covered, there’s still the issue of skin desiccating. The water in the outer layer of skin will evaporate, turning the skin to leather (or more accurately, mummy skin) the equivalent of freezer burn. The longer you are out, the worse the damage. I assume it would hurt while it happens. The lower the pressure, the lower the temperature at which water evaporates. Your skin is full of pores that go through the dead layer. At a certain point, you have a container layer that is probably impervious, like leather; the big question is, would it go deep enough to start affecting vital organs that are close to the surface, like the family jewels? Also, with it be stiff or will it be flexible - will any movement crack open that covering and create new leaks?
The other question is breathing. The experiences I recall reading are the opposite- early experimenters with da Vinci-like underwater breathing found that beyond a certain depth, breathing surface air did not work. The body was surrounded by higher pressure water, but was trying to inflate the lunges with sea-level-air-pressure air. Don’t recall what depth it became impossible, but I seem to remember it was not that deep. The problem would be the reverse in space - trying to exhale would be like trying to blow up a balloon.
The moral of the story is - Kids, don’t try this at home.
Keir Dullea discusses filming that scene (see the paragraph beginning “The most difficult shot…”): I met Keir Dullea tonight! - Cafe Society - Straight Dope Message Board
At the very least, Star-Lord could. He does have a magically-appearing mask that covers his eyes, nose, moth and ears, and he evidently has the rest of the gear necessary for a quick hop into space if necessary. So it’s hardly implausible to assume he has the incredibly complex piece of technology known as a “chest band”.
He also listens to cassettes on an 80s Walkman. Not all of his tech is advanced. 
An 80s Walkman and tape that are still functioning well decades later, after near-constant use. Yeah, that’s pretty advanced.
My walkman is still working.
Alright, I haven’t been using it constantly…
And probably not, I’m guessing, in hard vacuum.
“a critic panned the movie initially.” I remember in Toronto they kept showing it at the same theatre for several years until they tore the theatre down. An amazing run, especially compared to today.
And you hopefully have more than one tape.
Click below only if you have seen the first film otherwise it will ruin the ending for you COMPLETELY.
Peter Quill had a second mix tape.