The Vudu Facebook page had a notice that for a limited time, if you link your Vudu account to your Disney Movies Anywhere account, you’ll get a free digital copy of Monsters, Inc. But no need to worry if your Vudu account was already linked, this applies for linking any participating retailer (Vudu, iTunes, Google Play) account to your Disney Movies Anywhere account, including their two new additions, Amazon Video & Microsoft.
Just go to the Disney Movies Anywhere site, and click on Get Started at the bottom right. You will then be prompted to either sign in to your existing account or to create a new one. If you’re signing into an existing account, you’ll be shown a list of available retailers, and any you’ve already connected will be marked as such.
In my case, I selected Amazon Video as the new account to connect, and after signing into that, Monsters, Inc. appeared in all my connected accounts (I checked Vudu, Google Play, and Amazon Video and it appeared in all 3). I’ve also seen in the comments on the Vudu Facebook page that if you disconnect and reconnect you will also get the movie, so there’s that option if you have nothing new to connect.