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