▁t riv ia ▁text ▁comment ary ; ▁simple ▁games ; ▁film ▁short s ; ▁TV ▁sp ots ; ▁radio ▁sp ots ; ▁the atr ical ▁tra ilers ▁which ▁were ▁used ▁to ▁promote ▁the ▁main ▁title ; ▁and ▁te aser ▁tra ilers ▁advert ising ▁related ▁mov ies ▁or ▁DVD s . ▁ ▁Ext ra ▁features ▁often ▁provide ▁entertain ment ▁or ▁add ▁depth ▁and ▁understanding ▁to ▁the ▁film . ▁Games , ▁blo op ers , ▁and ▁gall eries ▁provide ▁entertain ment . ▁De leted ▁scenes ▁and ▁alternative ▁end ings ▁allow ▁the ▁audience ▁to ▁view ▁additional ▁content ▁which ▁was ▁not ▁included ▁in ▁a ▁the atr ical ▁release . ▁Direct ors ▁cut s ▁allow ▁the ▁audience ▁to ▁see ▁how ▁the ▁director ▁en vision ed ▁the ▁main ▁title ▁without ▁the ▁constraints ▁which ▁are ▁placed ▁on ▁a ▁the atr ical ▁release . ▁ ▁Other ▁ex tras ▁that ▁can ▁be ▁included ▁on ▁DVD s ▁are ▁motion ▁men us , ▁still ▁pictures , ▁up ▁to ▁ 3 2 ▁select able ▁subt it les , ▁se am less ▁branch ing ▁for ▁multiple ▁story lines , ▁up ▁to ▁ 9 ▁camera ▁angles , ▁and ▁DVD - ROM ▁/ ▁data ▁files ▁that ▁can ▁be ▁accessed ▁on ▁a ▁computer . ▁ ▁Ext ra ▁features ▁require ▁additional ▁storage ▁space , ▁which ▁often ▁means ▁encoding ▁the ▁main ▁title ▁with ▁lower ▁than ▁possible ▁data ▁rate ▁to ▁fit ▁both ▁the ▁main ▁title ▁and ▁the ▁ex tras ▁on ▁one ▁disc . ▁Lower ▁data ▁rate ▁may ▁decrease ▁visual ▁and ▁sound ▁quality , ▁which ▁manifest s ▁itself ▁in ▁various ▁compression ▁artifact s