Funny...like you, my application did not have a spot for my elevate number, and when I applied for the card, I did not even use the same e-mail address or physical address that my Elevate account is linked to, yet they somehow put the right number on the card.
The only bothersome thing I'm noticing is that I signed up on the Barclays website so I could manage my account online, but none of my transactions are showing up. I see my revolving credit limit dwindling by just about the amount I have charged, but my balance is $0.00 and no transactions listed. Grr!