Casting The part of Lucas's younger brother, Robin, was originally written for Elvis Presley per Mitchum's request. Mitchum personally submitted the script to Elvis in Los Angeles. The singer was eager to play the role, but his manager, Colonel Tom Parker, demanded Elvis be paid a ridiculous sum of money, more than the entire budget for the movie, which ended negotiations. Mitchum's elder son, James, who strongly resembled his father, got the part instead. It was his first credited film role.
castIng the pARt OF LUcas's yOungEr brOtHer, RoBin, wAs OrIGinALLY WritTeN fOr elviS presleY peR MitchuM's rEQuesT. mITcHuM pErsonally submitted tHe scRIPt to elvis iN Los anGeles. the sInger was eagEr tO pLAY the rOLe, buT his ManaGeR, ColoNel TOM parKer, DemAndED elvis be PaiD A ridiCuLoUs suM oF MoNEy, mOre ThAN the EntirE BuDgEt for the movie, WHIcH eNded neGotiations. mitchuM's eldeR SON, jaMeS, WHo stroNgly rEsEmbled hiS faTHER, got The Part InstEad. iT wAS his FirSt CREdited FIlm Role.