n apping ▁of ▁his ▁son ▁W alt ▁by ▁the ▁O thers , ▁would ▁be ▁explained ▁in ▁the ▁second ▁episode , ▁" Ad rift ". ▁The ▁cl iff h anger ▁also ▁influenced ▁the ▁tone : ▁the ▁protagon ists ▁are ▁expecting ▁an ▁attack ▁by ▁the ▁O thers , ▁but ▁the ▁audience ▁knows ▁the ▁O thers ▁are ▁not ▁coming ▁since ▁they ▁were ▁going ▁for ▁the ▁boat ▁instead . ▁To ▁make ▁the ▁episode ▁accessible ▁to ▁new ▁view ers , ▁many ▁instances ▁of ▁dialog ue ▁rec ap ▁events ▁of ▁the ▁first ▁season . ▁ ▁The ▁produ cers ▁decided ▁to ▁start ▁the ▁episode ▁inside ▁The ▁Sw an ▁because ▁they ▁considered ▁the ▁audience ▁would ▁expect ▁to ▁pick ▁up ▁from ▁Lock e ▁and ▁Jack ▁looking ▁into ▁the ▁h atch ▁sh aft , ▁so ▁the ▁opening ▁instead ▁is ▁fil med ▁in ▁a ▁place ▁that ▁does ▁not ▁reve al ▁its ▁location ▁or ▁period ▁- ▁Jack ▁B ender ▁stated ▁it ▁made ▁him ▁remember ▁a ▁San ▁Francisco ▁a partment ▁- ▁until ▁the ▁explos ion ▁of ▁the ▁h atch . ▁For ▁the ▁flash back s , ▁director ▁Jack ▁B ender ▁decided ▁to ▁avoid ▁making ▁the ▁hospital ▁scenes ▁similar ▁to ▁ER , ▁film ing ▁mostly ▁with ▁hand h eld ▁cam eras ▁to ▁give ▁a ▁" sp ont aneous ▁feel " ▁to ▁the ▁scene . ▁Sarah ' s ▁operation ▁was ▁fil med ▁in ▁an ▁actual ▁surg ery ▁room ▁in ▁O ahu , ▁while ▁Alo ha ▁Stadium ▁in ▁Hon ol ulu ▁is ▁used ▁for ▁Jack ▁and ▁Des mond ' s ▁tour ▁de ▁st ade . ▁ ▁Starting ▁in ▁this