They were really creative partners throughout the project. They were involved in picking and approving the song list, the venues we went into. With the dreamscapes, they saw storyboards of all the material, and gave feedback on whether or not they felt like those interpretations supported the songs in the way they wanted."
That wasn't all, though. "They really kept us honest on whether we were capturing the spirit of the band," continued Foster. "When you know who the Beatles are, and you know the joy in their faces when they play, you have to capture that on-screen. [...] They were really good at keeping the standard high."