They’ve just got one scene left for today (so says Michael), and Jim thinks it’s supposed to be a sort of touching moment of humanization for the villain, as he gives his tragic backstory— but this being a Michael Scott film, of course it doesn’t work that well. They've read through it in the (just a working draft for now, people!) script a couple times, and Jim can't help the swoop in his stomach at one particular stage direction:

[SANDRA gives GOLDENFACE a kiss.]

 In which a scene from Threat Level Midnight is filmed at Dunder Mifflin, and Jim may or may not flub some lines on purpose.