When Kenneth sees Tracey Jordan as a Muppet on the laptop, the picture in the corner of the screen is of human Kenneth. However, when Kenneth sees Liz in the hall and waves, he has a Muppet hand. If he has a Muppet hand, then he should have a Muppet head in the web video conference.
When Kenneth is talking to Jack about his key chain, at the end of his line, "everytime you move his head, his head moves...look!" The voiceover of when he says "look" doesn't match up.