The Polish rocker that Chuck and Sarah meet on the train is played by Tim Loden, Yvonne Strahovski's then boyfriend, now husband. They've been married since 2017 and have a son together, as of 2020.
Morgan mentions that Chuck is "a hard core DC Comics guy". Zachary Levi would go on to play the DC Comics superhero "Shazam" in the movie Shazam! (2019), as well as appearing in three Marvel Thor films as "Fandral" (2013-2022).