that seem to have been conjured up only 10 minutes prior to filming 
(ROOT (S (NP (DT that)) (VP (VBP seem) (S (VP (TO to) (VP (VB have) (VP (VBN been) (VP (VBN conjured) (PRT (RP up)) (PP (NP (QP (RB only) (CD 10)) (NNS minutes)) (JJ prior) (PP (IN to) (NP (NN filming))))))))))))
(ROOT (S (NP (DT )) (VP (VBP ) (S (VP (TO ) (VP (VB ) (VP (VBN ) (VP (VBN ) (PRT (RP )) (PP (NP (QP (RB ) (CD )) (NNS )) (JJ ) (PP (IN ) (NP (NN ))))))))))))