1 0 ▁people ▁passed ▁out ▁within ▁ 2 5   min utes ▁of ▁shooting ▁one ▁day . ▁Pa ula ▁Tru eman ▁col lapsed ▁and ▁was ▁taken ▁to ▁the ▁local ▁emer gency ▁room ▁to ▁be ▁treated ▁for ▁de h yd r ation . ▁Patrick ▁S way ze ▁also ▁required ▁a ▁hospital ▁visit ; ▁ins isting ▁on ▁doing ▁his ▁own ▁st un ts , ▁he ▁repeatedly ▁fell ▁off ▁the ▁log ▁during ▁the ▁" bal ancing " ▁scene ▁and ▁injured ▁his ▁kne e ▁so ▁badly ▁he ▁had ▁to ▁have ▁fluid ▁dra ined ▁from ▁the ▁sw elling . ▁ ▁Del ays ▁in ▁the ▁shooting ▁schedule ▁pushed ▁film ing ▁into ▁the ▁aut umn , ▁which ▁required ▁the ▁set ▁decor ators ▁to ▁sp ray - p aint ▁the ▁aut umn ▁leaves ▁green . ▁The ▁weather ▁became ▁cold , ▁causing ▁the ▁lake ' s ▁temper atures ▁to ▁drop ▁near ▁, ▁for ▁the ▁famous ▁sw imming ▁scene , ▁which ▁was ▁fil med ▁in ▁October . ▁Despite ▁her ▁character ' s ▁enjoy ment , ▁Grey ▁later ▁described ▁the ▁water ▁as ▁" hor r ific ally " ▁cold , ▁and ▁she ▁might ▁not ▁have ▁gone ▁into ▁the ▁lake , ▁except ▁that ▁she ▁was ▁" you ng ▁and ▁hun gry ". ▁ ▁Rel ations ▁between ▁the ▁two ▁main ▁stars ▁varied ▁throughout ▁production . ▁They ▁had ▁already ▁had ▁trouble ▁getting ▁along ▁in ▁their ▁previous ▁project , ▁Red ▁Da wn ▁( 1 9 8 4 ), ▁and ▁worked ▁things ▁out ▁enough ▁to ▁have ▁an ▁extremely ▁positive ▁screen ▁test , ▁but ▁that ▁initial ▁co operation ▁soon ▁f