Revealing mistake: When we see the new recruits at boot camp, they are wearing M1 Helmets. But if you look closely, they have rivets through the sides of each helmet where the chinstrap bales would be. In reality, the M1 helmet chinstrap bales were and continued to be welded onto the shell of the helmet. This indicates the helmets in the film are probably plastic replicas with the bales being riveted in place.

Captain America: The First Avenger (2011)
1 revealing mistake - chronological order
Directed by: Joe Johnston
Starring: Samuel L. Jackson, Chris Evans, Hugo Weaving, Dominic Cooper
Continuity mistake: After Steve throws Heinz Kruger, the assassin sent to kill him, out of his boat, both Steve and Heinz are bone dry despite being fully submerged in water only moments before.
Steve Rogers: I thought you were dead.
Bucky Barnes: I thought you were smaller.
Trivia: Before Steve Rogers exits the chamber that changes him into Captain America, the sound effect for the machine winding down is the same one as for the rocket pack shutting down in The Rocketeer, another Joe Johnston movie.
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Answer: It's a drinking song from 1883 called "There's a Tavern in the Town."
LorgSkyegon