When Kevin first starts in the kitchen at Chong's, he is chopping onions. You can hear the sound of a cat meowing in the background--which is an inside joke about cats and Chinese food.
When Paul and Kevin are talking about heading back from the lake, Paul says to take some back roads to I-91. I-91 runs from the Canadian border to New York City. This is another indicator that the show is set in the NY/NJ area.