0 1 5 , ▁it ▁was ▁announced ▁that ▁Andrew ▁Kreis berg , ▁co - cre ator ▁of ▁Ar row ▁and ▁The ▁Flash , ▁had ▁joined ▁the ▁series ▁as ▁a ▁writer ▁and ▁executive ▁producer ; ▁and ▁Ar row ▁/ ▁The ▁Flash ▁and ▁Small ville ▁al um ▁Glen ▁Winter ▁was ▁announced ▁to ▁be ▁direct ing ▁the ▁pilot . ▁Princi pal ▁phot ography ▁for ▁the ▁pilot ▁took ▁place ▁from ▁March ▁ 4 ▁to ▁March ▁ 2 9 , ▁ 2 0 1 5 . ▁Fil ming ▁locations ▁included ▁the ▁Warner ▁B ros . ▁lot , ▁where ▁Lo is ▁and ▁Clark ▁was ▁shot . ▁Each ▁episode ▁cost ▁approximately ▁$ 3 ▁million ▁to ▁broadcast , ▁which ▁is ▁one ▁of ▁the ▁highest ▁license ▁fe es ▁ever ▁for ▁a ▁first ▁year ▁show . ▁ ▁The ▁second ▁season ▁was ▁fil med ▁in ▁V ancouver , ▁rather ▁than ▁Los ▁Angeles ▁where ▁the ▁first ▁season ▁was ▁shot . ▁This ▁was ▁done ▁to ▁reduce ▁the ▁high ▁production ▁costs ▁of ▁the ▁series , ▁one ▁of ▁the ▁issues ▁that ▁made ▁CBS ▁w ary ▁to ▁renew ▁the ▁series ▁on ▁their ▁network . ▁Fil ming ▁for ▁the ▁third ▁season ▁began ▁in ▁V ancouver ▁on ▁July ▁ 6 , ▁ 2 0 1 7 , ▁and ▁ended ▁on ▁April ▁ 2 8 , ▁ 2 0 1 8 . ▁ ▁On ▁March ▁ 1 2 , ▁ 2 0 2 0 , ▁Warner ▁B ros . ▁Television ▁shut ▁down ▁production ▁on ▁the ▁series ▁due ▁to ▁the ▁ 2 0 1 9 – 2 0 ▁coron av irus ▁pan demic