Wow. They clearly had a great time making that, and that translated to me having a great time watching it. Plus, as someone who was always a fan of the Fred/Wesley paring, I was quite happy seeing those two playing romantically off each other again.
Nathan Fillion being Nathan Fillion, and Alexis Denisof rolling around "hiding" had to be my highlights. I thought it was a very fun version of that story.
I was also very surprised to see the BritAnNick guys in the movie. That was unexpected.