We just received a packet of info for an upcoming trip (more on that later), and I'm glad I checked it carefully.  Our profile address was wrong, which is why it took so long to reach us, and our daughter's age was 6 years older than she is.  Plus, the car seat we'd requested wasn't on the invoice.

Like I said, glad I checked.

My personal favorite so far as these things go was when we flew to Cologne on Continental a couple of years ago.  We were booked on a Monday afternoon flight.  Our daughter, who was supposed to be flying as a lap-child, was booked on a different flight, 12 hours earlier.  Someone would have been in for a big surprise.

I've heard that the infant ticket date and time doesn't really matter, but I didn't feel like testing that theory out at the airport.