The Danza: Probably the only occasion in recent history where this happened with an actor playing someone who really existed: Johnny Depp as John Dillinger. And the real Dillinger often was called "Johnnie". They coincidentally share initials.
Font Anachronism: As John Dillinger and his associates leave the red train car, the car number seen on the outside of the car is in the Helvetica font, which was not created until 1957. The film takes place in 1933, a couple decades too early for Helvetica.