The big musical number in Rogers: The Musical also happens to be a line Captain America has said at least twice in the MCU. The song, entitled "I Could Do This All Day," is a reference to Cap saying that very thing in both Captain America: The First Avenger and The Avengers. Now, would the general public know this is a thing Captain America said in the middle of the Battle of New York? That seems unlikely, but the song is so catchy, we'll let it slide.