Karl Urban and Gerard Butler were both considered for the part of Victor Creed. Michelle Monaghan was offered the role of Silver Fox, but though she wanted to work with Hugh Jackman she had to turn it down due to scheduling conflicts. [?] Michael C. Hall was at one point considered for the role of William Stryker.
Stoick the Vast has some experience and lines in common with another Gerard Butler character, Creedy in Reign of Fire, which was also about dragons. One such allusion comes during the battle scene where Stoick is fighting Drago.