A man with dark hair wearing a blazer sits in a talk show seat.

It must be a strange experience to act as a real-life person who’s actually in the room watching you shoot scenes, but it sounds like Daniel Radcliffe had a good time regardless.

The former Harry Potter star plays comedy musician Weird Al Yankovich in the parody biopic Weird: The Al Yankovich Story coming to Roku this week, and the man himself was apparently on set most days. But as Radcliffe tells Jimmy Fallon in the Tonight Show clip above, Weird Al only really had one bit of feedback for him.

« The thing he cared about the most, even an insane version of a biopic, was that he not look terrible at playing the instrument that he is famous for playing, » says Radcliffe. « So most of his notes were accordion-based. Most of them were particularly about how much I was pumping the bellows. I was not pumping enough. »