asse y ▁and ▁David ▁G iam mar co ▁mixed ▁the ▁background ▁music ▁using ▁A uro ▁ 1 1 . 1 ▁cinema ▁sound ▁technology ▁and ▁the ▁film ' s ▁sound track ▁was ▁rem ixed ▁using ▁Dol by ▁At mos , ▁A uro ▁and ▁Dol by ▁ 5 . 1 . ▁ ▁Post - production ▁The ▁film ▁was ▁mixed ▁in ▁A uro ▁ 1 1 . 1 ▁and ▁Dol by ▁At mos ▁in ▁the ▁converted ▁William ▁Hold en ▁Theater . ▁The ▁mix ▁for ▁both ▁was ▁completed ▁by ▁Paul ▁M asse y ▁and ▁David ▁G iam mar co . ▁ ▁A ▁mid - cred it ▁te aser ▁scene ▁from ▁X - Men : ▁Days ▁of ▁Future ▁Past ▁was ▁added ▁to ▁the ▁film ▁after ▁its ▁London ▁premi ere , ▁due ▁to ▁an ▁existing ▁deal ▁between ▁Web b ▁and ▁ 2 0 th ▁Century ▁Fox , ▁in ▁which ▁Fox ▁allowed ▁Web b ▁to ▁direct ▁the ▁film ▁if ▁Sony ▁would ▁promote ▁the ▁X - Men ▁film ▁for ▁free . ▁The ▁scene , ▁set ▁during ▁the ▁Vietnam ▁War , ▁shows ▁Myst ique ▁( J enn ifer ▁Lawrence ), ▁a ▁ro gue ▁mut ant , ▁trying ▁to ▁in fil tr ate ▁a ▁military ▁camp ▁led ▁by ▁William ▁S try ker ▁( J osh ▁Hel man ) ▁in ▁an ▁attempt ▁to ▁rec ruit ▁fellow ▁mut ants ▁Hav ok ▁( L uc as ▁Till ) ▁and ▁To ad ▁( E van ▁Jon igkeit ). ▁The ▁scene ' s ▁inclusion ▁spark ed ▁confusion ▁among ▁some ▁view ers ▁in ▁the ▁United ▁Kingdom , ▁who ▁thought