When Kelly goes underground, she finds a ladder (after she met the smoking guy).
She has a backpack on her right shoulder, and a flashlight in her right hand.
As she come closer of the ladder, she drops the sack on the ground, and the flashlight is still in her right hand. Then, the viewing angle change, on can see she's dropping the sack again, and the flashlight has suddenly disappeared.
The cell phone signal fluctuates in the lower levels between none at all, and good enough for high speed Internet,depending on the plot requirements. This is unrealistic, and would in fact remain reasonably consistent.
At 1:24 Kelly is being swarmed by moths, but the sound that is heard is that of bees or wasps. Moths make no sound when they fly.
The introduction to Kelly's blog states it "is an open forum for anyone interested in the study of the science behind every day supernatural phenoment."