I watched the Justin/Jennifer argument more than once. I think it was staged.
It was a totally ridiculous argument to have. Surely Justin is smart enough to realize that if your instructions tell you to go by train, there's no point in arguing with your partner over other modes of transportation you might take. The argument doesn't sound like any kind of real conversation, because it's not: these two are talking to the camera, not to each other.
Cameras cut away from Justin/Jennifer to the other racers twice, then cut back. The audio continues uninterrupted while this happens, but each time the camera returns to Justin/Jennifer, they have switched places. This argument consists of three separate takes spliced together to simulate a conversation. Conclusion: it was not a real argument. Maybe our beloved TAR production team has been getting really boring footage from other teams and this was the best thing they could come up with. If that's the case, I really hope they can drum up something more compelling, and quick.
Not to say that J/J aren't prone to some real differences of opinion. In fact, judging from her facial expressions and body language in their interview clips, she hates her brother's guts and can barely stand to be within twelve feet of him. Things seem to be OK when he steps back and lets her take the lead, as he did during the parking task. But the minute he opens his mouth to assert himself, look out. I really wonder what made them want to do the race together.
Speaking of staged moments, I have a hard time believing the dude who found the lost passport at the gas station came up with the idea of taking it to the airport all on his own. And once he got there, how'd he know which terminal to go to? (LAX has 6 huge terminals.) No sir, someone from the TAR crew told him where to go if he wanted to be on TV and get a hug from a showgirl. I suppose you could argue that this being a non-elimination leg, the crew needed to find a way to get the showgirls to Taipei in time to run the leg and not throw the whole schedule off by a day. Be that as it may, it's still pretty obvious that strings were pulled in Kaylani & Lisa's favor.
(You've got to love how the showgirls say they want to shatter stereotypes about how dumb they are, and then proceed to drop a passport almost immediately. They did make a nice recovery in Ep. 2, but one has to hope there won't be another deus ex machina the next time they screw up, particularly if they're on an elimination leg.)