Erhardt guest starred in episode 2438 with Moni, as she attempts to get her photographs into the newspaper. On stage Erhardt has appeared in Shakespeare's Much Ado About Nothing and Romeo and Juliet, and was a regular on the German television series Da kommt Kalle (2007-2011). His voice over work includes dubbing James Denton on Desperate Housewives, Johnny Depp in The Brave, and Chris O'Dowd in the Netflix film Mascots.