At the start of the episode when Neil is talking to Kitten on instant messenger, he looks over at his clock and and the time is 3:47. Yet when Chuck comes in his room he says, "Who in the hell are you talking to at 2:47 in the morning?".
When they use the Twinternet at the end, they cool it by placing it in a fish tank with antifreeze so it will run faster. Liquid submersion cooling requires an electrically non-conductive fluid, such as mineral oil. Placing the computer in antifreeze would just fry it.