Read the comic here.
No, that's not the same hatch Tony came out of. If you watch the previous strips, the cast walk around the front of the Owlship. Fox uses Tony's keys to open the passenger side door.
Although, now that I think about it, in both the movie and comic Nite Owl pilots the craft from the right hand seat. I wonder if that's due to the UK configuration of most cars - and the fact that both Alan Moore and Dave Gibbons are British. hmmmm.
Anyway, I'd already established that this is Tony Stark's take on the Owlship, so it's not too shocking he'd have adapted it for the more familiar "driver on the left" style of American vehicles.
Wow. I really am a geek, aren't I?