Barbie: She's not there

A recent email from Amazon:

Greetings from Amazon.co.uk,

We've noticed that customers who have purchased or rated I'm Not There [DVD] [2007] have also purchased Barbie - The Magic Of Pegasus - 2D Version [DVD] on DVD. For this reason, you might like to know that Barbie - The Magic Of Pegasus - 2D Version [DVD] will be released on 27 September 2010. You can pre-order yours for just £11.99 by following the link below.

A few things about this system generated email immediately strike me: 1) I can't think of two films more different. It's just so random. Okay, so a parent is a Dylan fan and has a daughter who's a Barbie fan (okay, as it happens, I am a Dylan fan and my daughter is a Barbie fan... but what are the chances?). But this buying another thing as someone else just because we've bought one thing the same... It's like the supermarket sending me an email saying: 'We've noticed that customers who have bought bread have also bought... rat poison/anchovies/laxatives/[insert random item as applicable]'.

2) It's obviously a 2D version if it's a DVD; 3) How have other people bought it if it's not out yet? (Presumably they've pre-booked it but Amazon do use the word purchased); 4) How many other customers have bought it? One? 2,468? Is that all they've bought on Amazon apart from I'm Not There? 4) Is there actually a connection between the two films?