When Jimmy closes the door in the breakroom, it makes a loud closing sound (obvious sound effect), but does not latch. Throughout the scene, it changes from being not latched (as he had left it) to being latched, although no one had a chance to fully close it.
When Dave asks Lisa (who is a math whiz) for the square root of 137, she states 11.046. The square root of 137 is actually 11.7046 (she omitted the "7" from her answer).