Other mistake: The crate, which had gaps between the boards, was buried about 8-10' deep, but it was free of dirt when it was being hoisted out of the hole. (01:14:25)
Plot hole: Seventeen-year-old Jane knew they went to the house to "strip it" (cabinetry, hardware, etc). After removing a chandelier, Jane went into another room and, for no legitimate reason, used a sledgehammer and made a hole in the wall. There just happened to be a stash of money easily accessible via the hole, which was half-way up the wall. (00:26:14)