Video: One of the most charming moments of Doctor Strange was the end tag which brought Thor into the Sanctum Sanctorum to ask for help from the Sorceror Supreme. Here's a little behind-the-scenes featurette from the Doctor Strange release which shows what goes into making these tags (besides beer).
The video explains that the tags are generally conceived and shot very late during the making of the actual movie, and that they're often not that tightly scripted. Therefore, the rapport of Thor and Doctor Strange here is basically improved by the actors themselves:
— Chris Hemsworth (@chrishemsworth) February 13, 2017
I'll admit it: This does make me excited to see Strange in Thor: Ragnarok, but Cumberbatch's American accent still makes my skin crawl. It also makes me want to apologise to everyone else in the world on behalf of Americans doing this.