There have been rumours circulating that Liv Tyler, during filming, accidentally steped on some moss, which she is allergic to, and is subsquently doing the remainder of her parts with blue screen, indoors.
Some reports state that she is doing all these back in the U.S, where she has gone to get treatment for it, others say that while she DID go to the States for treatment, she is now back in New Zealand to complete the filming.
As yet there can be no confirmations about this, or when it took place.