Of course. It's always magnets.

Okay, I can believe the rough ride was due to the lack of a DHD. And Sam fixing it because it was an unacceptable, uh, feature of the Earth's 'gate.

I don't know if their ears pop. Ears popping is generally due to pressure differentials. So if the pressure on the other side is the same, I don't think their ears necessarily have to pop.

I would totally buy that t-shirt.