ok, so the actual question here is: how to use 2 insert behaviors and set the redirect in the second one to use the session created by the first.
that you need to hand code, the session created by the first insert is named WADA_Insert_toys. so edit the redirect:
$WA_redirectURL = "../pages/halloween2.php?productID=[Insert_ID]";
to:
$WA_redirectURL = "../pages/halloween2.php?productID=".$_SESSION['WADA_Insert_toys'].";