1. You will have to get off the bike and then open the door. After the door has opened, you can go through the doorways on bike. At the very least, for me, Ghost Rider can go through the doorways on the Hellcarrier very smoothly.
2. Thanks for reporting this. A screenshot would be great.
By the way, do you have any problems using the hellcycle under water in the Atlantis levels?
1. Okay, I can do that.
2. I don't exactly know why, but it isn't doing that anymore. (Maybe my PC just needed a reboot.)
And when you said problems in Atlantis, did you mean it simply doesn't work? Because I think the multi-jump actions for every character are disabled for that level.