There is a character named Emmit Milbarge (Dan Akroyd's character in the movie is Austin Millbarge and Chase's is Emmett Fitz-Hume), the bug is called a GLG 4000 (while Akroyd and Chase are GLG 20's), and the famous "Dr., Dr., and Dr." routine is used.
The rival spy (Tricia Helfer) brought in to evaluate how Chuck's situation is being handled is named Alex Forrest, a reference to Glenn Close's "other woman" character.