When the doctor is testing the robotic arm, the space directly under the table is covered (presumably by a box or a panel with a hidden actor). However as the robotic arm is removed from the table, the space beneath it becomes empty and transparent.
The lobby card showing Craigis holding a woman in front of him is actually the actress who played his sister rather than his lover.
After Cragis is stabbed, you can see the protective patch/squib patch showing through his shirt.